drivers/media/v4l2-core/v4l2-ioctl.c

   1 /*
   2  * Video capture interface for Linux version 2
   3  *
   4  * A generic framework to process V4L2 ioctl commands.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * Authors:     Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
  12  *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/version.h>
  20
  21 #include <linux/videodev2.h>
  22
  23 #include <media/v4l2-common.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-fh.h>
  27 #include <media/v4l2-event.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/videobuf2-v4l2.h>
  30
  31 #include <trace/events/v4l2.h>
  32
  33 /* Zero out the end of the struct pointed to by p.  Everything after, but
  34  * not including, the specified field is cleared. */
  35 #define CLEAR_AFTER_FIELD(p, field) \
  36         memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
  37         0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
  38
  39 #define is_valid_ioctl(vfd, cmd) test_bit(_IOC_NR(cmd), (vfd)->valid_ioctls)
  40
  41 struct std_descr {
  42         v4l2_std_id std;
  43         const char *descr;
  44 };
  45
  46 static const struct std_descr standards[] = {
  47         { V4L2_STD_NTSC,        "NTSC"      },
  48         { V4L2_STD_NTSC_M,      "NTSC-M"    },
  49         { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
  50         { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
  51         { V4L2_STD_NTSC_443,    "NTSC-443"  },
  52         { V4L2_STD_PAL,         "PAL"       },
  53         { V4L2_STD_PAL_BG,      "PAL-BG"    },
  54         { V4L2_STD_PAL_B,       "PAL-B"     },
  55         { V4L2_STD_PAL_B1,      "PAL-B1"    },
  56         { V4L2_STD_PAL_G,       "PAL-G"     },
  57         { V4L2_STD_PAL_H,       "PAL-H"     },
  58         { V4L2_STD_PAL_I,       "PAL-I"     },
  59         { V4L2_STD_PAL_DK,      "PAL-DK"    },
  60         { V4L2_STD_PAL_D,       "PAL-D"     },
  61         { V4L2_STD_PAL_D1,      "PAL-D1"    },
  62         { V4L2_STD_PAL_K,       "PAL-K"     },
  63         { V4L2_STD_PAL_M,       "PAL-M"     },
  64         { V4L2_STD_PAL_N,       "PAL-N"     },
  65         { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
  66         { V4L2_STD_PAL_60,      "PAL-60"    },
  67         { V4L2_STD_SECAM,       "SECAM"     },
  68         { V4L2_STD_SECAM_B,     "SECAM-B"   },
  69         { V4L2_STD_SECAM_G,     "SECAM-G"   },
  70         { V4L2_STD_SECAM_H,     "SECAM-H"   },
  71         { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
  72         { V4L2_STD_SECAM_D,     "SECAM-D"   },
  73         { V4L2_STD_SECAM_K,     "SECAM-K"   },
  74         { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
  75         { V4L2_STD_SECAM_L,     "SECAM-L"   },
  76         { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
  77         { 0,                    "Unknown"   }
  78 };
  79
  80 /* video4linux standard ID conversion to standard name
  81  */
  82 const char *v4l2_norm_to_name(v4l2_std_id id)
  83 {
  84         u32 myid = id;
  85         int i;
  86
  87         /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
  88            64 bit comparations. So, on that architecture, with some gcc
  89            variants, compilation fails. Currently, the max value is 30bit wide.
  90          */
  91         BUG_ON(myid != id);
  92
  93         for (i = 0; standards[i].std; i++)
  94                 if (myid == standards[i].std)
  95                         break;
  96         return standards[i].descr;
  97 }
  98 EXPORT_SYMBOL(v4l2_norm_to_name);
  99
 100 /* Returns frame period for the given standard */
 101 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
 102 {
 103         if (id & V4L2_STD_525_60) {
 104                 frameperiod->numerator = 1001;
 105                 frameperiod->denominator = 30000;
 106         } else {
 107                 frameperiod->numerator = 1;
 108                 frameperiod->denominator = 25;
 109         }
 110 }
 111 EXPORT_SYMBOL(v4l2_video_std_frame_period);
 112
 113 /* Fill in the fields of a v4l2_standard structure according to the
 114    'id' and 'transmission' parameters.  Returns negative on error.  */
 115 int v4l2_video_std_construct(struct v4l2_standard *vs,
 116                              int id, const char *name)
 117 {
 118         vs->id = id;
 119         v4l2_video_std_frame_period(id, &vs->frameperiod);
 120         vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
 121         strlcpy(vs->name, name, sizeof(vs->name));
 122         return 0;
 123 }
 124 EXPORT_SYMBOL(v4l2_video_std_construct);
 125
 126 /* ----------------------------------------------------------------- */
 127 /* some arrays for pretty-printing debug messages of enum types      */
 128
 129 const char *v4l2_field_names[] = {
 130         [V4L2_FIELD_ANY]        = "any",
 131         [V4L2_FIELD_NONE]       = "none",
 132         [V4L2_FIELD_TOP]        = "top",
 133         [V4L2_FIELD_BOTTOM]     = "bottom",
 134         [V4L2_FIELD_INTERLACED] = "interlaced",
 135         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
 136         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
 137         [V4L2_FIELD_ALTERNATE]  = "alternate",
 138         [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
 139         [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
 140 };
 141 EXPORT_SYMBOL(v4l2_field_names);
 142
 143 const char *v4l2_type_names[] = {
 144         [0]                                = "0",
 145         [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
 146         [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
 147         [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
 148         [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
 149         [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
 150         [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
 151         [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
 152         [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
 153         [V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
 154         [V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
 155         [V4L2_BUF_TYPE_SDR_CAPTURE]        = "sdr-cap",
 156         [V4L2_BUF_TYPE_SDR_OUTPUT]         = "sdr-out",
 157 };
 158 EXPORT_SYMBOL(v4l2_type_names);
 159
 160 static const char *v4l2_memory_names[] = {
 161         [V4L2_MEMORY_MMAP]    = "mmap",
 162         [V4L2_MEMORY_USERPTR] = "userptr",
 163         [V4L2_MEMORY_OVERLAY] = "overlay",
 164         [V4L2_MEMORY_DMABUF] = "dmabuf",
 165 };
 166
 167 #define prt_names(a, arr) (((unsigned)(a)) < ARRAY_SIZE(arr) ? arr[a] : "unknown")
 168
 169 /* ------------------------------------------------------------------ */
 170 /* debug help functions                                               */
 171
 172 static void v4l_print_querycap(const void *arg, bool write_only)
 173 {
 174         const struct v4l2_capability *p = arg;
 175
 176         pr_cont("driver=%.*s, card=%.*s, bus=%.*s, version=0x%08x, "
 177                 "capabilities=0x%08x, device_caps=0x%08x\n",
 178                 (int)sizeof(p->driver), p->driver,
 179                 (int)sizeof(p->card), p->card,
 180                 (int)sizeof(p->bus_info), p->bus_info,
 181                 p->version, p->capabilities, p->device_caps);
 182 }
 183
 184 static void v4l_print_enuminput(const void *arg, bool write_only)
 185 {
 186         const struct v4l2_input *p = arg;
 187
 188         pr_cont("index=%u, name=%.*s, type=%u, audioset=0x%x, tuner=%u, "
 189                 "std=0x%08Lx, status=0x%x, capabilities=0x%x\n",
 190                 p->index, (int)sizeof(p->name), p->name, p->type, p->audioset,
 191                 p->tuner, (unsigned long long)p->std, p->status,
 192                 p->capabilities);
 193 }
 194
 195 static void v4l_print_enumoutput(const void *arg, bool write_only)
 196 {
 197         const struct v4l2_output *p = arg;
 198
 199         pr_cont("index=%u, name=%.*s, type=%u, audioset=0x%x, "
 200                 "modulator=%u, std=0x%08Lx, capabilities=0x%x\n",
 201                 p->index, (int)sizeof(p->name), p->name, p->type, p->audioset,
 202                 p->modulator, (unsigned long long)p->std, p->capabilities);
 203 }
 204
 205 static void v4l_print_audio(const void *arg, bool write_only)
 206 {
 207         const struct v4l2_audio *p = arg;
 208
 209         if (write_only)
 210                 pr_cont("index=%u, mode=0x%x\n", p->index, p->mode);
 211         else
 212                 pr_cont("index=%u, name=%.*s, capability=0x%x, mode=0x%x\n",
 213                         p->index, (int)sizeof(p->name), p->name,
 214                         p->capability, p->mode);
 215 }
 216
 217 static void v4l_print_audioout(const void *arg, bool write_only)
 218 {
 219         const struct v4l2_audioout *p = arg;
 220
 221         if (write_only)
 222                 pr_cont("index=%u\n", p->index);
 223         else
 224                 pr_cont("index=%u, name=%.*s, capability=0x%x, mode=0x%x\n",
 225                         p->index, (int)sizeof(p->name), p->name,
 226                         p->capability, p->mode);
 227 }
 228
 229 static void v4l_print_fmtdesc(const void *arg, bool write_only)
 230 {
 231         const struct v4l2_fmtdesc *p = arg;
 232
 233         pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, description='%.*s'\n",
 234                 p->index, prt_names(p->type, v4l2_type_names),
 235                 p->flags, (p->pixelformat & 0xff),
 236                 (p->pixelformat >>  8) & 0xff,
 237                 (p->pixelformat >> 16) & 0xff,
 238                 (p->pixelformat >> 24) & 0xff,
 239                 (int)sizeof(p->description), p->description);
 240 }
 241
 242 static void v4l_print_format(const void *arg, bool write_only)
 243 {
 244         const struct v4l2_format *p = arg;
 245         const struct v4l2_pix_format *pix;
 246         const struct v4l2_pix_format_mplane *mp;
 247         const struct v4l2_vbi_format *vbi;
 248         const struct v4l2_sliced_vbi_format *sliced;
 249         const struct v4l2_window *win;
 250         const struct v4l2_sdr_format *sdr;
 251         unsigned i;
 252
 253         pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
 254         switch (p->type) {
 255         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 256         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 257                 pix = &p->fmt.pix;
 258                 pr_cont(", width=%u, height=%u, "
 259                         "pixelformat=%c%c%c%c, field=%s, "
 260                         "bytesperline=%u, sizeimage=%u, colorspace=%d, "
 261                         "flags=0x%x, ycbcr_enc=%u, quantization=%u, "
 262                         "xfer_func=%u\n",
 263                         pix->width, pix->height,
 264                         (pix->pixelformat & 0xff),
 265                         (pix->pixelformat >>  8) & 0xff,
 266                         (pix->pixelformat >> 16) & 0xff,
 267                         (pix->pixelformat >> 24) & 0xff,
 268                         prt_names(pix->field, v4l2_field_names),
 269                         pix->bytesperline, pix->sizeimage,
 270                         pix->colorspace, pix->flags, pix->ycbcr_enc,
 271                         pix->quantization, pix->xfer_func);
 272                 break;
 273         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 274         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 275                 mp = &p->fmt.pix_mp;
 276                 pr_cont(", width=%u, height=%u, "
 277                         "format=%c%c%c%c, field=%s, "
 278                         "colorspace=%d, num_planes=%u, flags=0x%x, "
 279                         "ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
 280                         mp->width, mp->height,
 281                         (mp->pixelformat & 0xff),
 282                         (mp->pixelformat >>  8) & 0xff,
 283                         (mp->pixelformat >> 16) & 0xff,
 284                         (mp->pixelformat >> 24) & 0xff,
 285                         prt_names(mp->field, v4l2_field_names),
 286                         mp->colorspace, mp->num_planes, mp->flags,
 287                         mp->ycbcr_enc, mp->quantization, mp->xfer_func);
 288                 for (i = 0; i < mp->num_planes; i++)
 289                         printk(KERN_DEBUG "plane %u: bytesperline=%u sizeimage=%u\n", i,
 290                                         mp->plane_fmt[i].bytesperline,
 291                                         mp->plane_fmt[i].sizeimage);
 292                 break;
 293         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 294         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 295                 win = &p->fmt.win;
 296                 /* Note: we can't print the clip list here since the clips
 297                  * pointer is a userspace pointer, not a kernelspace
 298                  * pointer. */
 299                 pr_cont(", wxh=%dx%d, x,y=%d,%d, field=%s, chromakey=0x%08x, clipcount=%u, clips=%p, bitmap=%p, global_alpha=0x%02x\n",
 300                         win->w.width, win->w.height, win->w.left, win->w.top,
 301                         prt_names(win->field, v4l2_field_names),
 302                         win->chromakey, win->clipcount, win->clips,
 303                         win->bitmap, win->global_alpha);
 304                 break;
 305         case V4L2_BUF_TYPE_VBI_CAPTURE:
 306         case V4L2_BUF_TYPE_VBI_OUTPUT:
 307                 vbi = &p->fmt.vbi;
 308                 pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, "
 309                         "sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
 310                         vbi->sampling_rate, vbi->offset,
 311                         vbi->samples_per_line,
 312                         (vbi->sample_format & 0xff),
 313                         (vbi->sample_format >>  8) & 0xff,
 314                         (vbi->sample_format >> 16) & 0xff,
 315                         (vbi->sample_format >> 24) & 0xff,
 316                         vbi->start[0], vbi->start[1],
 317                         vbi->count[0], vbi->count[1]);
 318                 break;
 319         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 320         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 321                 sliced = &p->fmt.sliced;
 322                 pr_cont(", service_set=0x%08x, io_size=%d\n",
 323                                 sliced->service_set, sliced->io_size);
 324                 for (i = 0; i < 24; i++)
 325                         printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
 326                                 sliced->service_lines[0][i],
 327                                 sliced->service_lines[1][i]);
 328                 break;
 329         case V4L2_BUF_TYPE_SDR_CAPTURE:
 330         case V4L2_BUF_TYPE_SDR_OUTPUT:
 331                 sdr = &p->fmt.sdr;
 332                 pr_cont(", pixelformat=%c%c%c%c\n",
 333                         (sdr->pixelformat >>  0) & 0xff,
 334                         (sdr->pixelformat >>  8) & 0xff,
 335                         (sdr->pixelformat >> 16) & 0xff,
 336                         (sdr->pixelformat >> 24) & 0xff);
 337                 break;
 338         }
 339 }
 340
 341 static void v4l_print_framebuffer(const void *arg, bool write_only)
 342 {
 343         const struct v4l2_framebuffer *p = arg;
 344
 345         pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, "
 346                 "height=%u, pixelformat=%c%c%c%c, "
 347                 "bytesperline=%u, sizeimage=%u, colorspace=%d\n",
 348                         p->capability, p->flags, p->base,
 349                         p->fmt.width, p->fmt.height,
 350                         (p->fmt.pixelformat & 0xff),
 351                         (p->fmt.pixelformat >>  8) & 0xff,
 352                         (p->fmt.pixelformat >> 16) & 0xff,
 353                         (p->fmt.pixelformat >> 24) & 0xff,
 354                         p->fmt.bytesperline, p->fmt.sizeimage,
 355                         p->fmt.colorspace);
 356 }
 357
 358 static void v4l_print_buftype(const void *arg, bool write_only)
 359 {
 360         pr_cont("type=%s\n", prt_names(*(u32 *)arg, v4l2_type_names));
 361 }
 362
 363 static void v4l_print_modulator(const void *arg, bool write_only)
 364 {
 365         const struct v4l2_modulator *p = arg;
 366
 367         if (write_only)
 368                 pr_cont("index=%u, txsubchans=0x%x\n", p->index, p->txsubchans);
 369         else
 370                 pr_cont("index=%u, name=%.*s, capability=0x%x, "
 371                         "rangelow=%u, rangehigh=%u, txsubchans=0x%x\n",
 372                         p->index, (int)sizeof(p->name), p->name, p->capability,
 373                         p->rangelow, p->rangehigh, p->txsubchans);
 374 }
 375
 376 static void v4l_print_tuner(const void *arg, bool write_only)
 377 {
 378         const struct v4l2_tuner *p = arg;
 379
 380         if (write_only)
 381                 pr_cont("index=%u, audmode=%u\n", p->index, p->audmode);
 382         else
 383                 pr_cont("index=%u, name=%.*s, type=%u, capability=0x%x, "
 384                         "rangelow=%u, rangehigh=%u, signal=%u, afc=%d, "
 385                         "rxsubchans=0x%x, audmode=%u\n",
 386                         p->index, (int)sizeof(p->name), p->name, p->type,
 387                         p->capability, p->rangelow,
 388                         p->rangehigh, p->signal, p->afc,
 389                         p->rxsubchans, p->audmode);
 390 }
 391
 392 static void v4l_print_frequency(const void *arg, bool write_only)
 393 {
 394         const struct v4l2_frequency *p = arg;
 395
 396         pr_cont("tuner=%u, type=%u, frequency=%u\n",
 397                                 p->tuner, p->type, p->frequency);
 398 }
 399
 400 static void v4l_print_standard(const void *arg, bool write_only)
 401 {
 402         const struct v4l2_standard *p = arg;
 403
 404         pr_cont("index=%u, id=0x%Lx, name=%.*s, fps=%u/%u, "
 405                 "framelines=%u\n", p->index,
 406                 (unsigned long long)p->id, (int)sizeof(p->name), p->name,
 407                 p->frameperiod.numerator,
 408                 p->frameperiod.denominator,
 409                 p->framelines);
 410 }
 411
 412 static void v4l_print_std(const void *arg, bool write_only)
 413 {
 414         pr_cont("std=0x%08Lx\n", *(const long long unsigned *)arg);
 415 }
 416
 417 static void v4l_print_hw_freq_seek(const void *arg, bool write_only)
 418 {
 419         const struct v4l2_hw_freq_seek *p = arg;
 420
 421         pr_cont("tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u, "
 422                 "rangelow=%u, rangehigh=%u\n",
 423                 p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing,
 424                 p->rangelow, p->rangehigh);
 425 }
 426
 427 static void v4l_print_requestbuffers(const void *arg, bool write_only)
 428 {
 429         const struct v4l2_requestbuffers *p = arg;
 430
 431         pr_cont("count=%d, type=%s, memory=%s\n",
 432                 p->count,
 433                 prt_names(p->type, v4l2_type_names),
 434                 prt_names(p->memory, v4l2_memory_names));
 435 }
 436
 437 static void v4l_print_buffer(const void *arg, bool write_only)
 438 {
 439         const struct v4l2_buffer *p = arg;
 440         const struct v4l2_timecode *tc = &p->timecode;
 441         const struct v4l2_plane *plane;
 442         int i;
 443
 444         pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, "
 445                 "flags=0x%08x, field=%s, sequence=%d, memory=%s",
 446                         p->timestamp.tv_sec / 3600,
 447                         (int)(p->timestamp.tv_sec / 60) % 60,
 448                         (int)(p->timestamp.tv_sec % 60),
 449                         (long)p->timestamp.tv_usec,
 450                         p->index,
 451                         prt_names(p->type, v4l2_type_names),
 452                         p->flags, prt_names(p->field, v4l2_field_names),
 453                         p->sequence, prt_names(p->memory, v4l2_memory_names));
 454
 455         if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
 456                 pr_cont("\n");
 457                 for (i = 0; i < p->length; ++i) {
 458                         plane = &p->m.planes[i];
 459                         printk(KERN_DEBUG
 460                                 "plane %d: bytesused=%d, data_offset=0x%08x, "
 461                                 "offset/userptr=0x%lx, length=%d\n",
 462                                 i, plane->bytesused, plane->data_offset,
 463                                 plane->m.userptr, plane->length);
 464                 }
 465         } else {
 466                 pr_cont(", bytesused=%d, offset/userptr=0x%lx, length=%d\n",
 467                         p->bytesused, p->m.userptr, p->length);
 468         }
 469
 470         printk(KERN_DEBUG "timecode=%02d:%02d:%02d type=%d, "
 471                 "flags=0x%08x, frames=%d, userbits=0x%08x\n",
 472                         tc->hours, tc->minutes, tc->seconds,
 473                         tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
 474 }
 475
 476 static void v4l_print_exportbuffer(const void *arg, bool write_only)
 477 {
 478         const struct v4l2_exportbuffer *p = arg;
 479
 480         pr_cont("fd=%d, type=%s, index=%u, plane=%u, flags=0x%08x\n",
 481                 p->fd, prt_names(p->type, v4l2_type_names),
 482                 p->index, p->plane, p->flags);
 483 }
 484
 485 static void v4l_print_create_buffers(const void *arg, bool write_only)
 486 {
 487         const struct v4l2_create_buffers *p = arg;
 488
 489         pr_cont("index=%d, count=%d, memory=%s, ",
 490                         p->index, p->count,
 491                         prt_names(p->memory, v4l2_memory_names));
 492         v4l_print_format(&p->format, write_only);
 493 }
 494
 495 static void v4l_print_streamparm(const void *arg, bool write_only)
 496 {
 497         const struct v4l2_streamparm *p = arg;
 498
 499         pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
 500
 501         if (p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 502             p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
 503                 const struct v4l2_captureparm *c = &p->parm.capture;
 504
 505                 pr_cont(", capability=0x%x, capturemode=0x%x, timeperframe=%d/%d, "
 506                         "extendedmode=%d, readbuffers=%d\n",
 507                         c->capability, c->capturemode,
 508                         c->timeperframe.numerator, c->timeperframe.denominator,
 509                         c->extendedmode, c->readbuffers);
 510         } else if (p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 511                    p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
 512                 const struct v4l2_outputparm *c = &p->parm.output;
 513
 514                 pr_cont(", capability=0x%x, outputmode=0x%x, timeperframe=%d/%d, "
 515                         "extendedmode=%d, writebuffers=%d\n",
 516                         c->capability, c->outputmode,
 517                         c->timeperframe.numerator, c->timeperframe.denominator,
 518                         c->extendedmode, c->writebuffers);
 519         } else {
 520                 pr_cont("\n");
 521         }
 522 }
 523
 524 static void v4l_print_queryctrl(const void *arg, bool write_only)
 525 {
 526         const struct v4l2_queryctrl *p = arg;
 527
 528         pr_cont("id=0x%x, type=%d, name=%.*s, min/max=%d/%d, "
 529                 "step=%d, default=%d, flags=0x%08x\n",
 530                         p->id, p->type, (int)sizeof(p->name), p->name,
 531                         p->minimum, p->maximum,
 532                         p->step, p->default_value, p->flags);
 533 }
 534
 535 static void v4l_print_query_ext_ctrl(const void *arg, bool write_only)
 536 {
 537         const struct v4l2_query_ext_ctrl *p = arg;
 538
 539         pr_cont("id=0x%x, type=%d, name=%.*s, min/max=%lld/%lld, "
 540                 "step=%lld, default=%lld, flags=0x%08x, elem_size=%u, elems=%u, "
 541                 "nr_of_dims=%u, dims=%u,%u,%u,%u\n",
 542                         p->id, p->type, (int)sizeof(p->name), p->name,
 543                         p->minimum, p->maximum,
 544                         p->step, p->default_value, p->flags,
 545                         p->elem_size, p->elems, p->nr_of_dims,
 546                         p->dims[0], p->dims[1], p->dims[2], p->dims[3]);
 547 }
 548
 549 static void v4l_print_querymenu(const void *arg, bool write_only)
 550 {
 551         const struct v4l2_querymenu *p = arg;
 552
 553         pr_cont("id=0x%x, index=%d\n", p->id, p->index);
 554 }
 555
 556 static void v4l_print_control(const void *arg, bool write_only)
 557 {
 558         const struct v4l2_control *p = arg;
 559
 560         pr_cont("id=0x%x, value=%d\n", p->id, p->value);
 561 }
 562
 563 static void v4l_print_ext_controls(const void *arg, bool write_only)
 564 {
 565         const struct v4l2_ext_controls *p = arg;
 566         int i;
 567
 568         pr_cont("class=0x%x, count=%d, error_idx=%d",
 569                         p->ctrl_class, p->count, p->error_idx);
 570         for (i = 0; i < p->count; i++) {
 571                 if (!p->controls[i].size)
 572                         pr_cont(", id/val=0x%x/0x%x",
 573                                 p->controls[i].id, p->controls[i].value);
 574                 else
 575                         pr_cont(", id/size=0x%x/%u",
 576                                 p->controls[i].id, p->controls[i].size);
 577         }
 578         pr_cont("\n");
 579 }
 580
 581 static void v4l_print_cropcap(const void *arg, bool write_only)
 582 {
 583         const struct v4l2_cropcap *p = arg;
 584
 585         pr_cont("type=%s, bounds wxh=%dx%d, x,y=%d,%d, "
 586                 "defrect wxh=%dx%d, x,y=%d,%d, "
 587                 "pixelaspect %d/%d\n",
 588                 prt_names(p->type, v4l2_type_names),
 589                 p->bounds.width, p->bounds.height,
 590                 p->bounds.left, p->bounds.top,
 591                 p->defrect.width, p->defrect.height,
 592                 p->defrect.left, p->defrect.top,
 593                 p->pixelaspect.numerator, p->pixelaspect.denominator);
 594 }
 595
 596 static void v4l_print_crop(const void *arg, bool write_only)
 597 {
 598         const struct v4l2_crop *p = arg;
 599
 600         pr_cont("type=%s, wxh=%dx%d, x,y=%d,%d\n",
 601                 prt_names(p->type, v4l2_type_names),
 602                 p->c.width, p->c.height,
 603                 p->c.left, p->c.top);
 604 }
 605
 606 static void v4l_print_selection(const void *arg, bool write_only)
 607 {
 608         const struct v4l2_selection *p = arg;
 609
 610         pr_cont("type=%s, target=%d, flags=0x%x, wxh=%dx%d, x,y=%d,%d\n",
 611                 prt_names(p->type, v4l2_type_names),
 612                 p->target, p->flags,
 613                 p->r.width, p->r.height, p->r.left, p->r.top);
 614 }
 615
 616 static void v4l_print_jpegcompression(const void *arg, bool write_only)
 617 {
 618         const struct v4l2_jpegcompression *p = arg;
 619
 620         pr_cont("quality=%d, APPn=%d, APP_len=%d, "
 621                 "COM_len=%d, jpeg_markers=0x%x\n",
 622                 p->quality, p->APPn, p->APP_len,
 623                 p->COM_len, p->jpeg_markers);
 624 }
 625
 626 static void v4l_print_enc_idx(const void *arg, bool write_only)
 627 {
 628         const struct v4l2_enc_idx *p = arg;
 629
 630         pr_cont("entries=%d, entries_cap=%d\n",
 631                         p->entries, p->entries_cap);
 632 }
 633
 634 static void v4l_print_encoder_cmd(const void *arg, bool write_only)
 635 {
 636         const struct v4l2_encoder_cmd *p = arg;
 637
 638         pr_cont("cmd=%d, flags=0x%x\n",
 639                         p->cmd, p->flags);
 640 }
 641
 642 static void v4l_print_decoder_cmd(const void *arg, bool write_only)
 643 {
 644         const struct v4l2_decoder_cmd *p = arg;
 645
 646         pr_cont("cmd=%d, flags=0x%x\n", p->cmd, p->flags);
 647
 648         if (p->cmd == V4L2_DEC_CMD_START)
 649                 pr_info("speed=%d, format=%u\n",
 650                                 p->start.speed, p->start.format);
 651         else if (p->cmd == V4L2_DEC_CMD_STOP)
 652                 pr_info("pts=%llu\n", p->stop.pts);
 653 }
 654
 655 static void v4l_print_dbg_chip_info(const void *arg, bool write_only)
 656 {
 657         const struct v4l2_dbg_chip_info *p = arg;
 658
 659         pr_cont("type=%u, ", p->match.type);
 660         if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
 661                 pr_cont("name=%.*s, ",
 662                                 (int)sizeof(p->match.name), p->match.name);
 663         else
 664                 pr_cont("addr=%u, ", p->match.addr);
 665         pr_cont("name=%.*s\n", (int)sizeof(p->name), p->name);
 666 }
 667
 668 static void v4l_print_dbg_register(const void *arg, bool write_only)
 669 {
 670         const struct v4l2_dbg_register *p = arg;
 671
 672         pr_cont("type=%u, ", p->match.type);
 673         if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
 674                 pr_cont("name=%.*s, ",
 675                                 (int)sizeof(p->match.name), p->match.name);
 676         else
 677                 pr_cont("addr=%u, ", p->match.addr);
 678         pr_cont("reg=0x%llx, val=0x%llx\n",
 679                         p->reg, p->val);
 680 }
 681
 682 static void v4l_print_dv_timings(const void *arg, bool write_only)
 683 {
 684         const struct v4l2_dv_timings *p = arg;
 685
 686         switch (p->type) {
 687         case V4L2_DV_BT_656_1120:
 688                 pr_cont("type=bt-656/1120, interlaced=%u, "
 689                         "pixelclock=%llu, "
 690                         "width=%u, height=%u, polarities=0x%x, "
 691                         "hfrontporch=%u, hsync=%u, "
 692                         "hbackporch=%u, vfrontporch=%u, "
 693                         "vsync=%u, vbackporch=%u, "
 694                         "il_vfrontporch=%u, il_vsync=%u, "
 695                         "il_vbackporch=%u, standards=0x%x, flags=0x%x\n",
 696                                 p->bt.interlaced, p->bt.pixelclock,
 697                                 p->bt.width, p->bt.height,
 698                                 p->bt.polarities, p->bt.hfrontporch,
 699                                 p->bt.hsync, p->bt.hbackporch,
 700                                 p->bt.vfrontporch, p->bt.vsync,
 701                                 p->bt.vbackporch, p->bt.il_vfrontporch,
 702                                 p->bt.il_vsync, p->bt.il_vbackporch,
 703                                 p->bt.standards, p->bt.flags);
 704                 break;
 705         default:
 706                 pr_cont("type=%d\n", p->type);
 707                 break;
 708         }
 709 }
 710
 711 static void v4l_print_enum_dv_timings(const void *arg, bool write_only)
 712 {
 713         const struct v4l2_enum_dv_timings *p = arg;
 714
 715         pr_cont("index=%u, ", p->index);
 716         v4l_print_dv_timings(&p->timings, write_only);
 717 }
 718
 719 static void v4l_print_dv_timings_cap(const void *arg, bool write_only)
 720 {
 721         const struct v4l2_dv_timings_cap *p = arg;
 722
 723         switch (p->type) {
 724         case V4L2_DV_BT_656_1120:
 725                 pr_cont("type=bt-656/1120, width=%u-%u, height=%u-%u, "
 726                         "pixelclock=%llu-%llu, standards=0x%x, capabilities=0x%x\n",
 727                         p->bt.min_width, p->bt.max_width,
 728                         p->bt.min_height, p->bt.max_height,
 729                         p->bt.min_pixelclock, p->bt.max_pixelclock,
 730                         p->bt.standards, p->bt.capabilities);
 731                 break;
 732         default:
 733                 pr_cont("type=%u\n", p->type);
 734                 break;
 735         }
 736 }
 737
 738 static void v4l_print_frmsizeenum(const void *arg, bool write_only)
 739 {
 740         const struct v4l2_frmsizeenum *p = arg;
 741
 742         pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
 743                         p->index,
 744                         (p->pixel_format & 0xff),
 745                         (p->pixel_format >>  8) & 0xff,
 746                         (p->pixel_format >> 16) & 0xff,
 747                         (p->pixel_format >> 24) & 0xff,
 748                         p->type);
 749         switch (p->type) {
 750         case V4L2_FRMSIZE_TYPE_DISCRETE:
 751                 pr_cont(", wxh=%ux%u\n",
 752                         p->discrete.width, p->discrete.height);
 753                 break;
 754         case V4L2_FRMSIZE_TYPE_STEPWISE:
 755                 pr_cont(", min=%ux%u, max=%ux%u, step=%ux%u\n",
 756                                 p->stepwise.min_width,  p->stepwise.min_height,
 757                                 p->stepwise.step_width, p->stepwise.step_height,
 758                                 p->stepwise.max_width,  p->stepwise.max_height);
 759                 break;
 760         case V4L2_FRMSIZE_TYPE_CONTINUOUS:
 761                 /* fall through */
 762         default:
 763                 pr_cont("\n");
 764                 break;
 765         }
 766 }
 767
 768 static void v4l_print_frmivalenum(const void *arg, bool write_only)
 769 {
 770         const struct v4l2_frmivalenum *p = arg;
 771
 772         pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
 773                         p->index,
 774                         (p->pixel_format & 0xff),
 775                         (p->pixel_format >>  8) & 0xff,
 776                         (p->pixel_format >> 16) & 0xff,
 777                         (p->pixel_format >> 24) & 0xff,
 778                         p->width, p->height, p->type);
 779         switch (p->type) {
 780         case V4L2_FRMIVAL_TYPE_DISCRETE:
 781                 pr_cont(", fps=%d/%d\n",
 782                                 p->discrete.numerator,
 783                                 p->discrete.denominator);
 784                 break;
 785         case V4L2_FRMIVAL_TYPE_STEPWISE:
 786                 pr_cont(", min=%d/%d, max=%d/%d, step=%d/%d\n",
 787                                 p->stepwise.min.numerator,
 788                                 p->stepwise.min.denominator,
 789                                 p->stepwise.max.numerator,
 790                                 p->stepwise.max.denominator,
 791                                 p->stepwise.step.numerator,
 792                                 p->stepwise.step.denominator);
 793                 break;
 794         case V4L2_FRMIVAL_TYPE_CONTINUOUS:
 795                 /* fall through */
 796         default:
 797                 pr_cont("\n");
 798                 break;
 799         }
 800 }
 801
 802 static void v4l_print_event(const void *arg, bool write_only)
 803 {
 804         const struct v4l2_event *p = arg;
 805         const struct v4l2_event_ctrl *c;
 806
 807         pr_cont("type=0x%x, pending=%u, sequence=%u, id=%u, "
 808                 "timestamp=%lu.%9.9lu\n",
 809                         p->type, p->pending, p->sequence, p->id,
 810                         p->timestamp.tv_sec, p->timestamp.tv_nsec);
 811         switch (p->type) {
 812         case V4L2_EVENT_VSYNC:
 813                 printk(KERN_DEBUG "field=%s\n",
 814                         prt_names(p->u.vsync.field, v4l2_field_names));
 815                 break;
 816         case V4L2_EVENT_CTRL:
 817                 c = &p->u.ctrl;
 818                 printk(KERN_DEBUG "changes=0x%x, type=%u, ",
 819                         c->changes, c->type);
 820                 if (c->type == V4L2_CTRL_TYPE_INTEGER64)
 821                         pr_cont("value64=%lld, ", c->value64);
 822                 else
 823                         pr_cont("value=%d, ", c->value);
 824                 pr_cont("flags=0x%x, minimum=%d, maximum=%d, step=%d, "
 825                         "default_value=%d\n",
 826                         c->flags, c->minimum, c->maximum,
 827                         c->step, c->default_value);
 828                 break;
 829         case V4L2_EVENT_FRAME_SYNC:
 830                 pr_cont("frame_sequence=%u\n",
 831                         p->u.frame_sync.frame_sequence);
 832                 break;
 833         }
 834 }
 835
 836 static void v4l_print_event_subscription(const void *arg, bool write_only)
 837 {
 838         const struct v4l2_event_subscription *p = arg;
 839
 840         pr_cont("type=0x%x, id=0x%x, flags=0x%x\n",
 841                         p->type, p->id, p->flags);
 842 }
 843
 844 static void v4l_print_sliced_vbi_cap(const void *arg, bool write_only)
 845 {
 846         const struct v4l2_sliced_vbi_cap *p = arg;
 847         int i;
 848
 849         pr_cont("type=%s, service_set=0x%08x\n",
 850                         prt_names(p->type, v4l2_type_names), p->service_set);
 851         for (i = 0; i < 24; i++)
 852                 printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
 853                                 p->service_lines[0][i],
 854                                 p->service_lines[1][i]);
 855 }
 856
 857 static void v4l_print_freq_band(const void *arg, bool write_only)
 858 {
 859         const struct v4l2_frequency_band *p = arg;
 860
 861         pr_cont("tuner=%u, type=%u, index=%u, capability=0x%x, "
 862                 "rangelow=%u, rangehigh=%u, modulation=0x%x\n",
 863                         p->tuner, p->type, p->index,
 864                         p->capability, p->rangelow,
 865                         p->rangehigh, p->modulation);
 866 }
 867
 868 static void v4l_print_edid(const void *arg, bool write_only)
 869 {
 870         const struct v4l2_edid *p = arg;
 871
 872         pr_cont("pad=%u, start_block=%u, blocks=%u\n",
 873                 p->pad, p->start_block, p->blocks);
 874 }
 875
 876 static void v4l_print_u32(const void *arg, bool write_only)
 877 {
 878         pr_cont("value=%u\n", *(const u32 *)arg);
 879 }
 880
 881 static void v4l_print_newline(const void *arg, bool write_only)
 882 {
 883         pr_cont("\n");
 884 }
 885
 886 static void v4l_print_default(const void *arg, bool write_only)
 887 {
 888         pr_cont("driver-specific ioctl\n");
 889 }
 890
 891 static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
 892 {
 893         __u32 i;
 894
 895         /* zero the reserved fields */
 896         c->reserved[0] = c->reserved[1] = 0;
 897         for (i = 0; i < c->count; i++)
 898                 c->controls[i].reserved2[0] = 0;
 899
 900         /* V4L2_CID_PRIVATE_BASE cannot be used as control class
 901            when using extended controls.
 902            Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
 903            is it allowed for backwards compatibility.
 904          */
 905         if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
 906                 return 0;
 907         if (c->ctrl_class == 0)
 908                 return 1;
 909         /* Check that all controls are from the same control class. */
 910         for (i = 0; i < c->count; i++) {
 911                 if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
 912                         c->error_idx = i;
 913                         return 0;
 914                 }
 915         }
 916         return 1;
 917 }
 918
 919 static int check_fmt(struct file *file, enum v4l2_buf_type type)
 920 {
 921         struct video_device *vfd = video_devdata(file);
 922         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
 923         bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
 924         bool is_vbi = vfd->vfl_type == VFL_TYPE_VBI;
 925         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
 926         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
 927         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
 928
 929         if (ops == NULL)
 930                 return -EINVAL;
 931
 932         switch (type) {
 933         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 934                 if (is_vid && is_rx &&
 935                     (ops->vidioc_g_fmt_vid_cap || ops->vidioc_g_fmt_vid_cap_mplane))
 936                         return 0;
 937                 break;
 938         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 939                 if (is_vid && is_rx && ops->vidioc_g_fmt_vid_cap_mplane)
 940                         return 0;
 941                 break;
 942         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 943                 if (is_vid && is_rx && ops->vidioc_g_fmt_vid_overlay)
 944                         return 0;
 945                 break;
 946         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 947                 if (is_vid && is_tx &&
 948                     (ops->vidioc_g_fmt_vid_out || ops->vidioc_g_fmt_vid_out_mplane))
 949                         return 0;
 950                 break;
 951         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 952                 if (is_vid && is_tx && ops->vidioc_g_fmt_vid_out_mplane)
 953                         return 0;
 954                 break;
 955         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 956                 if (is_vid && is_tx && ops->vidioc_g_fmt_vid_out_overlay)
 957                         return 0;
 958                 break;
 959         case V4L2_BUF_TYPE_VBI_CAPTURE:
 960                 if (is_vbi && is_rx && ops->vidioc_g_fmt_vbi_cap)
 961                         return 0;
 962                 break;
 963         case V4L2_BUF_TYPE_VBI_OUTPUT:
 964                 if (is_vbi && is_tx && ops->vidioc_g_fmt_vbi_out)
 965                         return 0;
 966                 break;
 967         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 968                 if (is_vbi && is_rx && ops->vidioc_g_fmt_sliced_vbi_cap)
 969                         return 0;
 970                 break;
 971         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 972                 if (is_vbi && is_tx && ops->vidioc_g_fmt_sliced_vbi_out)
 973                         return 0;
 974                 break;
 975         case V4L2_BUF_TYPE_SDR_CAPTURE:
 976                 if (is_sdr && is_rx && ops->vidioc_g_fmt_sdr_cap)
 977                         return 0;
 978                 break;
 979         case V4L2_BUF_TYPE_SDR_OUTPUT:
 980                 if (is_sdr && is_tx && ops->vidioc_g_fmt_sdr_out)
 981                         return 0;
 982                 break;
 983         default:
 984                 break;
 985         }
 986         return -EINVAL;
 987 }
 988
 989 static void v4l_sanitize_format(struct v4l2_format *fmt)
 990 {
 991         unsigned int offset;
 992
 993         /*
 994          * The v4l2_pix_format structure has been extended with fields that were
 995          * not previously required to be set to zero by applications. The priv
 996          * field, when set to a magic value, indicates the the extended fields
 997          * are valid. Otherwise they will contain undefined values. To simplify
 998          * the API towards drivers zero the extended fields and set the priv
 999          * field to the magic value when the extended pixel format structure
1000          * isn't used by applications.
1001          */
1002
1003         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1004             fmt->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1005                 return;
1006
1007         if (fmt->fmt.pix.priv == V4L2_PIX_FMT_PRIV_MAGIC)
1008                 return;
1009
1010         fmt->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1011
1012         offset = offsetof(struct v4l2_pix_format, priv)
1013                + sizeof(fmt->fmt.pix.priv);
1014         memset(((void *)&fmt->fmt.pix) + offset, 0,
1015                sizeof(fmt->fmt.pix) - offset);
1016 }
1017
1018 static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
1019                                 struct file *file, void *fh, void *arg)
1020 {
1021         struct v4l2_capability *cap = (struct v4l2_capability *)arg;
1022         int ret;
1023
1024         cap->version = LINUX_VERSION_CODE;
1025
1026         ret = ops->vidioc_querycap(file, fh, cap);
1027
1028         cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT;
1029         /*
1030          * Drivers MUST fill in device_caps, so check for this and
1031          * warn if it was forgotten.
1032          */
1033         WARN(!(cap->capabilities & V4L2_CAP_DEVICE_CAPS) ||
1034                 !cap->device_caps, "Bad caps for driver %s, %x %x",
1035                 cap->driver, cap->capabilities, cap->device_caps);
1036         cap->device_caps |= V4L2_CAP_EXT_PIX_FORMAT;
1037
1038         return ret;
1039 }
1040
1041 static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
1042                                 struct file *file, void *fh, void *arg)
1043 {
1044         return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
1045 }
1046
1047 static int v4l_s_output(const struct v4l2_ioctl_ops *ops,
1048                                 struct file *file, void *fh, void *arg)
1049 {
1050         return ops->vidioc_s_output(file, fh, *(unsigned int *)arg);
1051 }
1052
1053 static int v4l_g_priority(const struct v4l2_ioctl_ops *ops,
1054                                 struct file *file, void *fh, void *arg)
1055 {
1056         struct video_device *vfd;
1057         u32 *p = arg;
1058
1059         vfd = video_devdata(file);
1060         *p = v4l2_prio_max(vfd->prio);
1061         return 0;
1062 }
1063
1064 static int v4l_s_priority(const struct v4l2_ioctl_ops *ops,
1065                                 struct file *file, void *fh, void *arg)
1066 {
1067         struct video_device *vfd;
1068         struct v4l2_fh *vfh;
1069         u32 *p = arg;
1070
1071         vfd = video_devdata(file);
1072         if (!test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
1073                 return -ENOTTY;
1074         vfh = file->private_data;
1075         return v4l2_prio_change(vfd->prio, &vfh->prio, *p);
1076 }
1077
1078 static int v4l_enuminput(const struct v4l2_ioctl_ops *ops,
1079                                 struct file *file, void *fh, void *arg)
1080 {
1081         struct video_device *vfd = video_devdata(file);
1082         struct v4l2_input *p = arg;
1083
1084         /*
1085          * We set the flags for CAP_DV_TIMINGS &
1086          * CAP_STD here based on ioctl handler provided by the
1087          * driver. If the driver doesn't support these
1088          * for a specific input, it must override these flags.
1089          */
1090         if (is_valid_ioctl(vfd, VIDIOC_S_STD))
1091                 p->capabilities |= V4L2_IN_CAP_STD;
1092
1093         return ops->vidioc_enum_input(file, fh, p);
1094 }
1095
1096 static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
1097                                 struct file *file, void *fh, void *arg)
1098 {
1099         struct video_device *vfd = video_devdata(file);
1100         struct v4l2_output *p = arg;
1101
1102         /*
1103          * We set the flags for CAP_DV_TIMINGS &
1104          * CAP_STD here based on ioctl handler provided by the
1105          * driver. If the driver doesn't support these
1106          * for a specific output, it must override these flags.
1107          */
1108         if (is_valid_ioctl(vfd, VIDIOC_S_STD))
1109                 p->capabilities |= V4L2_OUT_CAP_STD;
1110
1111         return ops->vidioc_enum_output(file, fh, p);
1112 }
1113
1114 static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
1115 {
1116         const unsigned sz = sizeof(fmt->description);
1117         const char *descr = NULL;
1118         u32 flags = 0;
1119
1120         /*
1121          * We depart from the normal coding style here since the descriptions
1122          * should be aligned so it is easy to see which descriptions will be
1123          * longer than 31 characters (the max length for a description).
1124          * And frankly, this is easier to read anyway.
1125          *
1126          * Note that gcc will use O(log N) comparisons to find the right case.
1127          */
1128         switch (fmt->pixelformat) {
1129         /* Max description length mask: descr = "0123456789012345678901234567890" */
1130         case V4L2_PIX_FMT_RGB332:       descr = "8-bit RGB 3-3-2"; break;
1131         case V4L2_PIX_FMT_RGB444:       descr = "16-bit A/XRGB 4-4-4-4"; break;
1132         case V4L2_PIX_FMT_ARGB444:      descr = "16-bit ARGB 4-4-4-4"; break;
1133         case V4L2_PIX_FMT_XRGB444:      descr = "16-bit XRGB 4-4-4-4"; break;
1134         case V4L2_PIX_FMT_RGB555:       descr = "16-bit A/XRGB 1-5-5-5"; break;
1135         case V4L2_PIX_FMT_ARGB555:      descr = "16-bit ARGB 1-5-5-5"; break;
1136         case V4L2_PIX_FMT_XRGB555:      descr = "16-bit XRGB 1-5-5-5"; break;
1137         case V4L2_PIX_FMT_RGB565:       descr = "16-bit RGB 5-6-5"; break;
1138         case V4L2_PIX_FMT_RGB555X:      descr = "16-bit A/XRGB 1-5-5-5 BE"; break;
1139         case V4L2_PIX_FMT_ARGB555X:     descr = "16-bit ARGB 1-5-5-5 BE"; break;
1140         case V4L2_PIX_FMT_XRGB555X:     descr = "16-bit XRGB 1-5-5-5 BE"; break;
1141         case V4L2_PIX_FMT_RGB565X:      descr = "16-bit RGB 5-6-5 BE"; break;
1142         case V4L2_PIX_FMT_BGR666:       descr = "18-bit BGRX 6-6-6-14"; break;
1143         case V4L2_PIX_FMT_BGR24:        descr = "24-bit BGR 8-8-8"; break;
1144         case V4L2_PIX_FMT_RGB24:        descr = "24-bit RGB 8-8-8"; break;
1145         case V4L2_PIX_FMT_BGR32:        descr = "32-bit BGRA/X 8-8-8-8"; break;
1146         case V4L2_PIX_FMT_ABGR32:       descr = "32-bit BGRA 8-8-8-8"; break;
1147         case V4L2_PIX_FMT_XBGR32:       descr = "32-bit BGRX 8-8-8-8"; break;
1148         case V4L2_PIX_FMT_RGB32:        descr = "32-bit A/XRGB 8-8-8-8"; break;
1149         case V4L2_PIX_FMT_ARGB32:       descr = "32-bit ARGB 8-8-8-8"; break;
1150         case V4L2_PIX_FMT_XRGB32:       descr = "32-bit XRGB 8-8-8-8"; break;
1151         case V4L2_PIX_FMT_GREY:         descr = "8-bit Greyscale"; break;
1152         case V4L2_PIX_FMT_Y4:           descr = "4-bit Greyscale"; break;
1153         case V4L2_PIX_FMT_Y6:           descr = "6-bit Greyscale"; break;
1154         case V4L2_PIX_FMT_Y10:          descr = "10-bit Greyscale"; break;
1155         case V4L2_PIX_FMT_Y12:          descr = "12-bit Greyscale"; break;
1156         case V4L2_PIX_FMT_Y16:          descr = "16-bit Greyscale"; break;
1157         case V4L2_PIX_FMT_Y16_BE:       descr = "16-bit Greyscale BE"; break;
1158         case V4L2_PIX_FMT_Y10BPACK:     descr = "10-bit Greyscale (Packed)"; break;
1159         case V4L2_PIX_FMT_PAL8:         descr = "8-bit Palette"; break;
1160         case V4L2_PIX_FMT_UV8:          descr = "8-bit Chrominance UV 4-4"; break;
1161         case V4L2_PIX_FMT_YVU410:       descr = "Planar YVU 4:1:0"; break;
1162         case V4L2_PIX_FMT_YVU420:       descr = "Planar YVU 4:2:0"; break;
1163         case V4L2_PIX_FMT_YUYV:         descr = "YUYV 4:2:2"; break;
1164         case V4L2_PIX_FMT_YYUV:         descr = "YYUV 4:2:2"; break;
1165         case V4L2_PIX_FMT_YVYU:         descr = "YVYU 4:2:2"; break;
1166         case V4L2_PIX_FMT_UYVY:         descr = "UYVY 4:2:2"; break;
1167         case V4L2_PIX_FMT_VYUY:         descr = "VYUY 4:2:2"; break;
1168         case V4L2_PIX_FMT_YUV422P:      descr = "Planar YVU 4:2:2"; break;
1169         case V4L2_PIX_FMT_YUV411P:      descr = "Planar YUV 4:1:1"; break;
1170         case V4L2_PIX_FMT_Y41P:         descr = "YUV 4:1:1 (Packed)"; break;
1171         case V4L2_PIX_FMT_YUV444:       descr = "16-bit A/XYUV 4-4-4-4"; break;
1172         case V4L2_PIX_FMT_YUV555:       descr = "16-bit A/XYUV 1-5-5-5"; break;
1173         case V4L2_PIX_FMT_YUV565:       descr = "16-bit YUV 5-6-5"; break;
1174         case V4L2_PIX_FMT_YUV32:        descr = "32-bit A/XYUV 8-8-8-8"; break;
1175         case V4L2_PIX_FMT_YUV410:       descr = "Planar YUV 4:1:0"; break;
1176         case V4L2_PIX_FMT_YUV420:       descr = "Planar YUV 4:2:0"; break;
1177         case V4L2_PIX_FMT_HI240:        descr = "8-bit Dithered RGB (BTTV)"; break;
1178         case V4L2_PIX_FMT_HM12:         descr = "YUV 4:2:0 (16x16 Macroblocks)"; break;
1179         case V4L2_PIX_FMT_M420:         descr = "YUV 4:2:0 (M420)"; break;
1180         case V4L2_PIX_FMT_NV12:         descr = "Y/CbCr 4:2:0"; break;
1181         case V4L2_PIX_FMT_NV21:         descr = "Y/CrCb 4:2:0"; break;
1182         case V4L2_PIX_FMT_NV16:         descr = "Y/CbCr 4:2:2"; break;
1183         case V4L2_PIX_FMT_NV61:         descr = "Y/CrCb 4:2:2"; break;
1184         case V4L2_PIX_FMT_NV24:         descr = "Y/CbCr 4:4:4"; break;
1185         case V4L2_PIX_FMT_NV42:         descr = "Y/CrCb 4:4:4"; break;
1186         case V4L2_PIX_FMT_NV12M:        descr = "Y/CbCr 4:2:0 (N-C)"; break;
1187         case V4L2_PIX_FMT_NV21M:        descr = "Y/CrCb 4:2:0 (N-C)"; break;
1188         case V4L2_PIX_FMT_NV16M:        descr = "Y/CbCr 4:2:2 (N-C)"; break;
1189         case V4L2_PIX_FMT_NV61M:        descr = "Y/CrCb 4:2:2 (N-C)"; break;
1190         case V4L2_PIX_FMT_NV12MT:       descr = "Y/CbCr 4:2:0 (64x32 MB, N-C)"; break;
1191         case V4L2_PIX_FMT_NV12MT_16X16: descr = "Y/CbCr 4:2:0 (16x16 MB, N-C)"; break;
1192         case V4L2_PIX_FMT_YUV420M:      descr = "Planar YUV 4:2:0 (N-C)"; break;
1193         case V4L2_PIX_FMT_YVU420M:      descr = "Planar YVU 4:2:0 (N-C)"; break;
1194         case V4L2_PIX_FMT_SBGGR8:       descr = "8-bit Bayer BGBG/GRGR"; break;
1195         case V4L2_PIX_FMT_SGBRG8:       descr = "8-bit Bayer GBGB/RGRG"; break;
1196         case V4L2_PIX_FMT_SGRBG8:       descr = "8-bit Bayer GRGR/BGBG"; break;
1197         case V4L2_PIX_FMT_SRGGB8:       descr = "8-bit Bayer RGRG/GBGB"; break;
1198         case V4L2_PIX_FMT_SBGGR10:      descr = "10-bit Bayer BGBG/GRGR"; break;
1199         case V4L2_PIX_FMT_SGBRG10:      descr = "10-bit Bayer GBGB/RGRG"; break;
1200         case V4L2_PIX_FMT_SGRBG10:      descr = "10-bit Bayer GRGR/BGBG"; break;
1201         case V4L2_PIX_FMT_SRGGB10:      descr = "10-bit Bayer RGRG/GBGB"; break;
1202         case V4L2_PIX_FMT_SBGGR12:      descr = "12-bit Bayer BGBG/GRGR"; break;
1203         case V4L2_PIX_FMT_SGBRG12:      descr = "12-bit Bayer GBGB/RGRG"; break;
1204         case V4L2_PIX_FMT_SGRBG12:      descr = "12-bit Bayer GRGR/BGBG"; break;
1205         case V4L2_PIX_FMT_SRGGB12:      descr = "12-bit Bayer RGRG/GBGB"; break;
1206         case V4L2_PIX_FMT_SBGGR10P:     descr = "10-bit Bayer BGBG/GRGR Packed"; break;
1207         case V4L2_PIX_FMT_SGBRG10P:     descr = "10-bit Bayer GBGB/RGRG Packed"; break;
1208         case V4L2_PIX_FMT_SGRBG10P:     descr = "10-bit Bayer GRGR/BGBG Packed"; break;
1209         case V4L2_PIX_FMT_SRGGB10P:     descr = "10-bit Bayer RGRG/GBGB Packed"; break;
1210         case V4L2_PIX_FMT_SBGGR10ALAW8: descr = "8-bit Bayer BGBG/GRGR (A-law)"; break;
1211         case V4L2_PIX_FMT_SGBRG10ALAW8: descr = "8-bit Bayer GBGB/RGRG (A-law)"; break;
1212         case V4L2_PIX_FMT_SGRBG10ALAW8: descr = "8-bit Bayer GRGR/BGBG (A-law)"; break;
1213         case V4L2_PIX_FMT_SRGGB10ALAW8: descr = "8-bit Bayer RGRG/GBGB (A-law)"; break;
1214         case V4L2_PIX_FMT_SBGGR10DPCM8: descr = "8-bit Bayer BGBG/GRGR (DPCM)"; break;
1215         case V4L2_PIX_FMT_SGBRG10DPCM8: descr = "8-bit Bayer GBGB/RGRG (DPCM)"; break;
1216         case V4L2_PIX_FMT_SGRBG10DPCM8: descr = "8-bit Bayer GRGR/BGBG (DPCM)"; break;
1217         case V4L2_PIX_FMT_SRGGB10DPCM8: descr = "8-bit Bayer RGRG/GBGB (DPCM)"; break;
1218         case V4L2_PIX_FMT_SBGGR16:      descr = "16-bit Bayer BGBG/GRGR (Exp.)"; break;
1219         case V4L2_PIX_FMT_SN9C20X_I420: descr = "GSPCA SN9C20X I420"; break;
1220         case V4L2_PIX_FMT_SPCA501:      descr = "GSPCA SPCA501"; break;
1221         case V4L2_PIX_FMT_SPCA505:      descr = "GSPCA SPCA505"; break;
1222         case V4L2_PIX_FMT_SPCA508:      descr = "GSPCA SPCA508"; break;
1223         case V4L2_PIX_FMT_STV0680:      descr = "GSPCA STV0680"; break;
1224         case V4L2_PIX_FMT_TM6000:       descr = "A/V + VBI Mux Packet"; break;
1225         case V4L2_PIX_FMT_CIT_YYVYUY:   descr = "GSPCA CIT YYVYUY"; break;
1226         case V4L2_PIX_FMT_KONICA420:    descr = "GSPCA KONICA420"; break;
1227         case V4L2_SDR_FMT_CU8:          descr = "Complex U8"; break;
1228         case V4L2_SDR_FMT_CU16LE:       descr = "Complex U16LE"; break;
1229         case V4L2_SDR_FMT_CS8:          descr = "Complex S8"; break;
1230         case V4L2_SDR_FMT_CS14LE:       descr = "Complex S14LE"; break;
1231         case V4L2_SDR_FMT_RU12LE:       descr = "Real U12LE"; break;
1232
1233         default:
1234                 /* Compressed formats */
1235                 flags = V4L2_FMT_FLAG_COMPRESSED;
1236                 switch (fmt->pixelformat) {
1237                 /* Max description length mask: descr = "0123456789012345678901234567890" */
1238                 case V4L2_PIX_FMT_MJPEG:        descr = "Motion-JPEG"; break;
1239                 case V4L2_PIX_FMT_JPEG:         descr = "JFIF JPEG"; break;
1240                 case V4L2_PIX_FMT_DV:           descr = "1394"; break;
1241                 case V4L2_PIX_FMT_MPEG:         descr = "MPEG-1/2/4"; break;
1242                 case V4L2_PIX_FMT_H264:         descr = "H.264"; break;
1243                 case V4L2_PIX_FMT_H264_NO_SC:   descr = "H.264 (No Start Codes)"; break;
1244                 case V4L2_PIX_FMT_H264_MVC:     descr = "H.264 MVC"; break;
1245                 case V4L2_PIX_FMT_H263:         descr = "H.263"; break;
1246                 case V4L2_PIX_FMT_MPEG1:        descr = "MPEG-1 ES"; break;
1247                 case V4L2_PIX_FMT_MPEG2:        descr = "MPEG-2 ES"; break;
1248                 case V4L2_PIX_FMT_MPEG4:        descr = "MPEG-4 part 2 ES"; break;
1249                 case V4L2_PIX_FMT_XVID:         descr = "Xvid"; break;
1250                 case V4L2_PIX_FMT_VC1_ANNEX_G:  descr = "VC-1 (SMPTE 412M Annex G)"; break;
1251                 case V4L2_PIX_FMT_VC1_ANNEX_L:  descr = "VC-1 (SMPTE 412M Annex L)"; break;
1252                 case V4L2_PIX_FMT_VP8:          descr = "VP8"; break;
1253                 case V4L2_PIX_FMT_CPIA1:        descr = "GSPCA CPiA YUV"; break;
1254                 case V4L2_PIX_FMT_WNVA:         descr = "WNVA"; break;
1255                 case V4L2_PIX_FMT_SN9C10X:      descr = "GSPCA SN9C10X"; break;
1256                 case V4L2_PIX_FMT_PWC1:         descr = "Raw Philips Webcam Type (Old)"; break;
1257                 case V4L2_PIX_FMT_PWC2:         descr = "Raw Philips Webcam Type (New)"; break;
1258                 case V4L2_PIX_FMT_ET61X251:     descr = "GSPCA ET61X251"; break;
1259                 case V4L2_PIX_FMT_SPCA561:      descr = "GSPCA SPCA561"; break;
1260                 case V4L2_PIX_FMT_PAC207:       descr = "GSPCA PAC207"; break;
1261                 case V4L2_PIX_FMT_MR97310A:     descr = "GSPCA MR97310A"; break;
1262                 case V4L2_PIX_FMT_JL2005BCD:    descr = "GSPCA JL2005BCD"; break;
1263                 case V4L2_PIX_FMT_SN9C2028:     descr = "GSPCA SN9C2028"; break;
1264                 case V4L2_PIX_FMT_SQ905C:       descr = "GSPCA SQ905C"; break;
1265                 case V4L2_PIX_FMT_PJPG:         descr = "GSPCA PJPG"; break;
1266                 case V4L2_PIX_FMT_OV511:        descr = "GSPCA OV511"; break;
1267                 case V4L2_PIX_FMT_OV518:        descr = "GSPCA OV518"; break;
1268                 case V4L2_PIX_FMT_JPGL:         descr = "JPEG Lite"; break;
1269                 case V4L2_PIX_FMT_SE401:        descr = "GSPCA SE401"; break;
1270                 case V4L2_PIX_FMT_S5C_UYVY_JPG: descr = "S5C73MX interleaved UYVY/JPEG"; break;
1271                 default:
1272                         WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
1273                         if (fmt->description[0])
1274                                 return;
1275                         flags = 0;
1276                         snprintf(fmt->description, sz, "%c%c%c%c%s",
1277                                         (char)(fmt->pixelformat & 0x7f),
1278                                         (char)((fmt->pixelformat >> 8) & 0x7f),
1279                                         (char)((fmt->pixelformat >> 16) & 0x7f),
1280                                         (char)((fmt->pixelformat >> 24) & 0x7f),
1281                                         (fmt->pixelformat & (1 << 31)) ? "-BE" : "");
1282                         break;
1283                 }
1284         }
1285
1286         if (descr)
1287                 WARN_ON(strlcpy(fmt->description, descr, sz) >= sz);
1288         fmt->flags = flags;
1289 }
1290
1291 static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
1292                                 struct file *file, void *fh, void *arg)
1293 {
1294         struct v4l2_fmtdesc *p = arg;
1295         struct video_device *vfd = video_devdata(file);
1296         bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1297         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1298         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1299         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1300         int ret = -EINVAL;
1301
1302         switch (p->type) {
1303         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1304                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap))
1305                         break;
1306                 ret = ops->vidioc_enum_fmt_vid_cap(file, fh, arg);
1307                 break;
1308         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1309                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap_mplane))
1310                         break;
1311                 ret = ops->vidioc_enum_fmt_vid_cap_mplane(file, fh, arg);
1312                 break;
1313         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1314                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_overlay))
1315                         break;
1316                 ret = ops->vidioc_enum_fmt_vid_overlay(file, fh, arg);
1317                 break;
1318         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1319                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out))
1320                         break;
1321                 ret = ops->vidioc_enum_fmt_vid_out(file, fh, arg);
1322                 break;
1323         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1324                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out_mplane))
1325                         break;
1326                 ret = ops->vidioc_enum_fmt_vid_out_mplane(file, fh, arg);
1327                 break;
1328         case V4L2_BUF_TYPE_SDR_CAPTURE:
1329                 if (unlikely(!is_rx || !is_sdr || !ops->vidioc_enum_fmt_sdr_cap))
1330                         break;
1331                 ret = ops->vidioc_enum_fmt_sdr_cap(file, fh, arg);
1332                 break;
1333         case V4L2_BUF_TYPE_SDR_OUTPUT:
1334                 if (unlikely(!is_tx || !is_sdr || !ops->vidioc_enum_fmt_sdr_out))
1335                         break;
1336                 ret = ops->vidioc_enum_fmt_sdr_out(file, fh, arg);
1337                 break;
1338         }
1339         if (ret == 0)
1340                 v4l_fill_fmtdesc(p);
1341         return ret;
1342 }
1343
1344 static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
1345                                 struct file *file, void *fh, void *arg)
1346 {
1347         struct v4l2_format *p = arg;
1348         struct video_device *vfd = video_devdata(file);
1349         bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1350         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1351         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1352         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1353         int ret;
1354
1355         /*
1356          * fmt can't be cleared for these overlay types due to the 'clips'
1357          * 'clipcount' and 'bitmap' pointers in struct v4l2_window.
1358          * Those are provided by the user. So handle these two overlay types
1359          * first, and then just do a simple memset for the other types.
1360          */
1361         switch (p->type) {
1362         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1363         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: {
1364                 struct v4l2_clip __user *clips = p->fmt.win.clips;
1365                 u32 clipcount = p->fmt.win.clipcount;
1366                 void __user *bitmap = p->fmt.win.bitmap;
1367
1368                 memset(&p->fmt, 0, sizeof(p->fmt));
1369                 p->fmt.win.clips = clips;
1370                 p->fmt.win.clipcount = clipcount;
1371                 p->fmt.win.bitmap = bitmap;
1372                 break;
1373         }
1374         default:
1375                 memset(&p->fmt, 0, sizeof(p->fmt));
1376                 break;
1377         }
1378
1379         switch (p->type) {
1380         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1381                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap))
1382                         break;
1383                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1384                 ret = ops->vidioc_g_fmt_vid_cap(file, fh, arg);
1385                 /* just in case the driver zeroed it again */
1386                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1387                 return ret;
1388         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1389                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap_mplane))
1390                         break;
1391                 return ops->vidioc_g_fmt_vid_cap_mplane(file, fh, arg);
1392         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1393                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_overlay))
1394                         break;
1395                 return ops->vidioc_g_fmt_vid_overlay(file, fh, arg);
1396         case V4L2_BUF_TYPE_VBI_CAPTURE:
1397                 if (unlikely(!is_rx || is_vid || !ops->vidioc_g_fmt_vbi_cap))
1398                         break;
1399                 return ops->vidioc_g_fmt_vbi_cap(file, fh, arg);
1400         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1401                 if (unlikely(!is_rx || is_vid || !ops->vidioc_g_fmt_sliced_vbi_cap))
1402                         break;
1403                 return ops->vidioc_g_fmt_sliced_vbi_cap(file, fh, arg);
1404         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1405                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out))
1406                         break;
1407                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1408                 ret = ops->vidioc_g_fmt_vid_out(file, fh, arg);
1409                 /* just in case the driver zeroed it again */
1410                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1411                 return ret;
1412         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1413                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out_mplane))
1414                         break;
1415                 return ops->vidioc_g_fmt_vid_out_mplane(file, fh, arg);
1416         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1417                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out_overlay))
1418                         break;
1419                 return ops->vidioc_g_fmt_vid_out_overlay(file, fh, arg);
1420         case V4L2_BUF_TYPE_VBI_OUTPUT:
1421                 if (unlikely(!is_tx || is_vid || !ops->vidioc_g_fmt_vbi_out))
1422                         break;
1423                 return ops->vidioc_g_fmt_vbi_out(file, fh, arg);
1424         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1425                 if (unlikely(!is_tx || is_vid || !ops->vidioc_g_fmt_sliced_vbi_out))
1426                         break;
1427                 return ops->vidioc_g_fmt_sliced_vbi_out(file, fh, arg);
1428         case V4L2_BUF_TYPE_SDR_CAPTURE:
1429                 if (unlikely(!is_rx || !is_sdr || !ops->vidioc_g_fmt_sdr_cap))
1430                         break;
1431                 return ops->vidioc_g_fmt_sdr_cap(file, fh, arg);
1432         case V4L2_BUF_TYPE_SDR_OUTPUT:
1433                 if (unlikely(!is_tx || !is_sdr || !ops->vidioc_g_fmt_sdr_out))
1434                         break;
1435                 return ops->vidioc_g_fmt_sdr_out(file, fh, arg);
1436         }
1437         return -EINVAL;
1438 }
1439
1440 static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
1441                                 struct file *file, void *fh, void *arg)
1442 {
1443         struct v4l2_format *p = arg;
1444         struct video_device *vfd = video_devdata(file);
1445         bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1446         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1447         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1448         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1449         int ret;
1450
1451         v4l_sanitize_format(p);
1452
1453         switch (p->type) {
1454         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1455                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_cap))
1456                         break;
1457                 CLEAR_AFTER_FIELD(p, fmt.pix);
1458                 ret = ops->vidioc_s_fmt_vid_cap(file, fh, arg);
1459                 /* just in case the driver zeroed it again */
1460                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1461                 return ret;
1462         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1463                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_cap_mplane))
1464                         break;
1465                 CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1466                 return ops->vidioc_s_fmt_vid_cap_mplane(file, fh, arg);
1467         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1468                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_overlay))
1469                         break;
1470                 CLEAR_AFTER_FIELD(p, fmt.win);
1471                 return ops->vidioc_s_fmt_vid_overlay(file, fh, arg);
1472         case V4L2_BUF_TYPE_VBI_CAPTURE:
1473                 if (unlikely(!is_rx || is_vid || !ops->vidioc_s_fmt_vbi_cap))
1474                         break;
1475                 CLEAR_AFTER_FIELD(p, fmt.vbi);
1476                 return ops->vidioc_s_fmt_vbi_cap(file, fh, arg);
1477         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1478                 if (unlikely(!is_rx || is_vid || !ops->vidioc_s_fmt_sliced_vbi_cap))
1479                         break;
1480                 CLEAR_AFTER_FIELD(p, fmt.sliced);
1481                 return ops->vidioc_s_fmt_sliced_vbi_cap(file, fh, arg);
1482         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1483                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out))
1484                         break;
1485                 CLEAR_AFTER_FIELD(p, fmt.pix);
1486                 ret = ops->vidioc_s_fmt_vid_out(file, fh, arg);
1487                 /* just in case the driver zeroed it again */
1488                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1489                 return ret;
1490         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1491                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out_mplane))
1492                         break;
1493                 CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1494                 return ops->vidioc_s_fmt_vid_out_mplane(file, fh, arg);
1495         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1496                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out_overlay))
1497                         break;
1498                 CLEAR_AFTER_FIELD(p, fmt.win);
1499                 return ops->vidioc_s_fmt_vid_out_overlay(file, fh, arg);
1500         case V4L2_BUF_TYPE_VBI_OUTPUT:
1501                 if (unlikely(!is_tx || is_vid || !ops->vidioc_s_fmt_vbi_out))
1502                         break;
1503                 CLEAR_AFTER_FIELD(p, fmt.vbi);
1504                 return ops->vidioc_s_fmt_vbi_out(file, fh, arg);
1505         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1506                 if (unlikely(!is_tx || is_vid || !ops->vidioc_s_fmt_sliced_vbi_out))
1507                         break;
1508                 CLEAR_AFTER_FIELD(p, fmt.sliced);
1509                 return ops->vidioc_s_fmt_sliced_vbi_out(file, fh, arg);
1510         case V4L2_BUF_TYPE_SDR_CAPTURE:
1511                 if (unlikely(!is_rx || !is_sdr || !ops->vidioc_s_fmt_sdr_cap))
1512                         break;
1513                 CLEAR_AFTER_FIELD(p, fmt.sdr);
1514                 return ops->vidioc_s_fmt_sdr_cap(file, fh, arg);
1515         case V4L2_BUF_TYPE_SDR_OUTPUT:
1516                 if (unlikely(!is_tx || !is_sdr || !ops->vidioc_s_fmt_sdr_out))
1517                         break;
1518                 CLEAR_AFTER_FIELD(p, fmt.sdr);
1519                 return ops->vidioc_s_fmt_sdr_out(file, fh, arg);
1520         }
1521         return -EINVAL;
1522 }
1523
1524 static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
1525                                 struct file *file, void *fh, void *arg)
1526 {
1527         struct v4l2_format *p = arg;
1528         struct video_device *vfd = video_devdata(file);
1529         bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1530         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1531         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1532         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1533         int ret;
1534
1535         v4l_sanitize_format(p);
1536
1537         switch (p->type) {
1538         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1539                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_cap))
1540                         break;
1541                 CLEAR_AFTER_FIELD(p, fmt.pix);
1542                 ret = ops->vidioc_try_fmt_vid_cap(file, fh, arg);
1543                 /* just in case the driver zeroed it again */
1544                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1545                 return ret;
1546         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1547                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_cap_mplane))
1548                         break;
1549                 CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1550                 return ops->vidioc_try_fmt_vid_cap_mplane(file, fh, arg);
1551         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1552                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_overlay))
1553                         break;
1554                 CLEAR_AFTER_FIELD(p, fmt.win);
1555                 return ops->vidioc_try_fmt_vid_overlay(file, fh, arg);
1556         case V4L2_BUF_TYPE_VBI_CAPTURE:
1557                 if (unlikely(!is_rx || is_vid || !ops->vidioc_try_fmt_vbi_cap))
1558                         break;
1559                 CLEAR_AFTER_FIELD(p, fmt.vbi);
1560                 return ops->vidioc_try_fmt_vbi_cap(file, fh, arg);
1561         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1562                 if (unlikely(!is_rx || is_vid || !ops->vidioc_try_fmt_sliced_vbi_cap))
1563                         break;
1564                 CLEAR_AFTER_FIELD(p, fmt.sliced);
1565                 return ops->vidioc_try_fmt_sliced_vbi_cap(file, fh, arg);
1566         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1567                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out))
1568                         break;
1569                 CLEAR_AFTER_FIELD(p, fmt.pix);
1570                 ret = ops->vidioc_try_fmt_vid_out(file, fh, arg);
1571                 /* just in case the driver zeroed it again */
1572                 p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1573                 return ret;
1574         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1575                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out_mplane))
1576                         break;
1577                 CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1578                 return ops->vidioc_try_fmt_vid_out_mplane(file, fh, arg);
1579         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1580                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out_overlay))
1581                         break;
1582                 CLEAR_AFTER_FIELD(p, fmt.win);
1583                 return ops->vidioc_try_fmt_vid_out_overlay(file, fh, arg);
1584         case V4L2_BUF_TYPE_VBI_OUTPUT:
1585                 if (unlikely(!is_tx || is_vid || !ops->vidioc_try_fmt_vbi_out))
1586                         break;
1587                 CLEAR_AFTER_FIELD(p, fmt.vbi);
1588                 return ops->vidioc_try_fmt_vbi_out(file, fh, arg);
1589         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1590                 if (unlikely(!is_tx || is_vid || !ops->vidioc_try_fmt_sliced_vbi_out))
1591                         break;
1592                 CLEAR_AFTER_FIELD(p, fmt.sliced);
1593                 return ops->vidioc_try_fmt_sliced_vbi_out(file, fh, arg);
1594         case V4L2_BUF_TYPE_SDR_CAPTURE:
1595                 if (unlikely(!is_rx || !is_sdr || !ops->vidioc_try_fmt_sdr_cap))
1596                         break;
1597                 CLEAR_AFTER_FIELD(p, fmt.sdr);
1598                 return ops->vidioc_try_fmt_sdr_cap(file, fh, arg);
1599         case V4L2_BUF_TYPE_SDR_OUTPUT:
1600                 if (unlikely(!is_tx || !is_sdr || !ops->vidioc_try_fmt_sdr_out))
1601                         break;
1602                 CLEAR_AFTER_FIELD(p, fmt.sdr);
1603                 return ops->vidioc_try_fmt_sdr_out(file, fh, arg);
1604         }
1605         return -EINVAL;
1606 }
1607
1608 static int v4l_streamon(const struct v4l2_ioctl_ops *ops,
1609                                 struct file *file, void *fh, void *arg)
1610 {
1611         return ops->vidioc_streamon(file, fh, *(unsigned int *)arg);
1612 }
1613
1614 static int v4l_streamoff(const struct v4l2_ioctl_ops *ops,
1615                                 struct file *file, void *fh, void *arg)
1616 {
1617         return ops->vidioc_streamoff(file, fh, *(unsigned int *)arg);
1618 }
1619
1620 static int v4l_g_tuner(const struct v4l2_ioctl_ops *ops,
1621                                 struct file *file, void *fh, void *arg)
1622 {
1623         struct video_device *vfd = video_devdata(file);
1624         struct v4l2_tuner *p = arg;
1625         int err;
1626
1627         p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1628                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1629         err = ops->vidioc_g_tuner(file, fh, p);
1630         if (!err)
1631                 p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
1632         return err;
1633 }
1634
1635 static int v4l_s_tuner(const struct v4l2_ioctl_ops *ops,
1636                                 struct file *file, void *fh, void *arg)
1637 {
1638         struct video_device *vfd = video_devdata(file);
1639         struct v4l2_tuner *p = arg;
1640
1641         p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1642                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1643         return ops->vidioc_s_tuner(file, fh, p);
1644 }
1645
1646 static int v4l_g_modulator(const struct v4l2_ioctl_ops *ops,
1647                                 struct file *file, void *fh, void *arg)
1648 {
1649         struct video_device *vfd = video_devdata(file);
1650         struct v4l2_modulator *p = arg;
1651         int err;
1652
1653         if (vfd->vfl_type == VFL_TYPE_RADIO)
1654                 p->type = V4L2_TUNER_RADIO;
1655
1656         err = ops->vidioc_g_modulator(file, fh, p);
1657         if (!err)
1658                 p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
1659         return err;
1660 }
1661
1662 static int v4l_s_modulator(const struct v4l2_ioctl_ops *ops,
1663                                 struct file *file, void *fh, void *arg)
1664 {
1665         struct video_device *vfd = video_devdata(file);
1666         struct v4l2_modulator *p = arg;
1667
1668         if (vfd->vfl_type == VFL_TYPE_RADIO)
1669                 p->type = V4L2_TUNER_RADIO;
1670
1671         return ops->vidioc_s_modulator(file, fh, p);
1672 }
1673
1674 static int v4l_g_frequency(const struct v4l2_ioctl_ops *ops,
1675                                 struct file *file, void *fh, void *arg)
1676 {
1677         struct video_device *vfd = video_devdata(file);
1678         struct v4l2_frequency *p = arg;
1679
1680         if (vfd->vfl_type == VFL_TYPE_SDR)
1681                 p->type = V4L2_TUNER_SDR;
1682         else
1683                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1684                                 V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1685         return ops->vidioc_g_frequency(file, fh, p);
1686 }
1687
1688 static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
1689                                 struct file *file, void *fh, void *arg)
1690 {
1691         struct video_device *vfd = video_devdata(file);
1692         const struct v4l2_frequency *p = arg;
1693         enum v4l2_tuner_type type;
1694
1695         if (vfd->vfl_type == VFL_TYPE_SDR) {
1696                 if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
1697                         return -EINVAL;
1698         } else {
1699                 type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1700                                 V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1701                 if (type != p->type)
1702                         return -EINVAL;
1703         }
1704         return ops->vidioc_s_frequency(file, fh, p);
1705 }
1706
1707 static int v4l_enumstd(const struct v4l2_ioctl_ops *ops,
1708                                 struct file *file, void *fh, void *arg)
1709 {
1710         struct video_device *vfd = video_devdata(file);
1711         struct v4l2_standard *p = arg;
1712         v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1713         unsigned int index = p->index, i, j = 0;
1714         const char *descr = "";
1715
1716         /* Return -ENODATA if the tvnorms for the current input
1717            or output is 0, meaning that it doesn't support this API. */
1718         if (id == 0)
1719                 return -ENODATA;
1720
1721         /* Return norm array in a canonical way */
1722         for (i = 0; i <= index && id; i++) {
1723                 /* last std value in the standards array is 0, so this
1724                    while always ends there since (id & 0) == 0. */
1725                 while ((id & standards[j].std) != standards[j].std)
1726                         j++;
1727                 curr_id = standards[j].std;
1728                 descr = standards[j].descr;
1729                 j++;
1730                 if (curr_id == 0)
1731                         break;
1732                 if (curr_id != V4L2_STD_PAL &&
1733                                 curr_id != V4L2_STD_SECAM &&
1734                                 curr_id != V4L2_STD_NTSC)
1735                         id &= ~curr_id;
1736         }
1737         if (i <= index)
1738                 return -EINVAL;
1739
1740         v4l2_video_std_construct(p, curr_id, descr);
1741         return 0;
1742 }
1743
1744 static int v4l_s_std(const struct v4l2_ioctl_ops *ops,
1745                                 struct file *file, void *fh, void *arg)
1746 {
1747         struct video_device *vfd = video_devdata(file);
1748         v4l2_std_id id = *(v4l2_std_id *)arg, norm;
1749
1750         norm = id & vfd->tvnorms;
1751         if (vfd->tvnorms && !norm)      /* Check if std is supported */
1752                 return -EINVAL;
1753
1754         /* Calls the specific handler */
1755         return ops->vidioc_s_std(file, fh, norm);
1756 }
1757
1758 static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
1759                                 struct file *file, void *fh, void *arg)
1760 {
1761         struct video_device *vfd = video_devdata(file);
1762         v4l2_std_id *p = arg;
1763
1764         /*
1765          * If no signal is detected, then the driver should return
1766          * V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
1767          * any standards that do not apply removed.
1768          *
1769          * This means that tuners, audio and video decoders can join
1770          * their efforts to improve the standards detection.
1771          */
1772         *p = vfd->tvnorms;
1773         return ops->vidioc_querystd(file, fh, arg);
1774 }
1775
1776 static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
1777                                 struct file *file, void *fh, void *arg)
1778 {
1779         struct video_device *vfd = video_devdata(file);
1780         struct v4l2_hw_freq_seek *p = arg;
1781         enum v4l2_tuner_type type;
1782
1783         /* s_hw_freq_seek is not supported for SDR for now */
1784         if (vfd->vfl_type == VFL_TYPE_SDR)
1785                 return -EINVAL;
1786
1787         type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1788                 V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1789         if (p->type != type)
1790                 return -EINVAL;
1791         return ops->vidioc_s_hw_freq_seek(file, fh, p);
1792 }
1793
1794 static int v4l_overlay(const struct v4l2_ioctl_ops *ops,
1795                                 struct file *file, void *fh, void *arg)
1796 {
1797         return ops->vidioc_overlay(file, fh, *(unsigned int *)arg);
1798 }
1799
1800 static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
1801                                 struct file *file, void *fh, void *arg)
1802 {
1803         struct v4l2_requestbuffers *p = arg;
1804         int ret = check_fmt(file, p->type);
1805
1806         if (ret)
1807                 return ret;
1808
1809         CLEAR_AFTER_FIELD(p, memory);
1810
1811         return ops->vidioc_reqbufs(file, fh, p);
1812 }
1813
1814 static int v4l_querybuf(const struct v4l2_ioctl_ops *ops,
1815                                 struct file *file, void *fh, void *arg)
1816 {
1817         struct v4l2_buffer *p = arg;
1818         int ret = check_fmt(file, p->type);
1819
1820         return ret ? ret : ops->vidioc_querybuf(file, fh, p);
1821 }
1822
1823 static int v4l_qbuf(const struct v4l2_ioctl_ops *ops,
1824                                 struct file *file, void *fh, void *arg)
1825 {
1826         struct v4l2_buffer *p = arg;
1827         int ret = check_fmt(file, p->type);
1828
1829         return ret ? ret : ops->vidioc_qbuf(file, fh, p);
1830 }
1831
1832 static int v4l_dqbuf(const struct v4l2_ioctl_ops *ops,
1833                                 struct file *file, void *fh, void *arg)
1834 {
1835         struct v4l2_buffer *p = arg;
1836         int ret = check_fmt(file, p->type);
1837
1838         return ret ? ret : ops->vidioc_dqbuf(file, fh, p);
1839 }
1840
1841 static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
1842                                 struct file *file, void *fh, void *arg)
1843 {
1844         struct v4l2_create_buffers *create = arg;
1845         int ret = check_fmt(file, create->format.type);
1846
1847         if (ret)
1848                 return ret;
1849
1850         CLEAR_AFTER_FIELD(create, format);
1851
1852         v4l_sanitize_format(&create->format);
1853
1854         ret = ops->vidioc_create_bufs(file, fh, create);
1855
1856         if (create->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1857             create->format.type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1858                 create->format.fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1859
1860         return ret;
1861 }
1862
1863 static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
1864                                 struct file *file, void *fh, void *arg)
1865 {
1866         struct v4l2_buffer *b = arg;
1867         int ret = check_fmt(file, b->type);
1868
1869         return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
1870 }
1871
1872 static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
1873                                 struct file *file, void *fh, void *arg)
1874 {
1875         struct v4l2_streamparm *p = arg;
1876         v4l2_std_id std;
1877         int ret = check_fmt(file, p->type);
1878
1879         if (ret)
1880                 return ret;
1881         if (ops->vidioc_g_parm)
1882                 return ops->vidioc_g_parm(file, fh, p);
1883         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1884             p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1885                 return -EINVAL;
1886         p->parm.capture.readbuffers = 2;
1887         ret = ops->vidioc_g_std(file, fh, &std);
1888         if (ret == 0)
1889                 v4l2_video_std_frame_period(std, &p->parm.capture.timeperframe);
1890         return ret;
1891 }
1892
1893 static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
1894                                 struct file *file, void *fh, void *arg)
1895 {
1896         struct v4l2_streamparm *p = arg;
1897         int ret = check_fmt(file, p->type);
1898
1899         return ret ? ret : ops->vidioc_s_parm(file, fh, p);
1900 }
1901
1902 static int v4l_queryctrl(const struct v4l2_ioctl_ops *ops,
1903                                 struct file *file, void *fh, void *arg)
1904 {
1905         struct video_device *vfd = video_devdata(file);
1906         struct v4l2_queryctrl *p = arg;
1907         struct v4l2_fh *vfh =
1908                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1909
1910         if (vfh && vfh->ctrl_handler)
1911                 return v4l2_queryctrl(vfh->ctrl_handler, p);
1912         if (vfd->ctrl_handler)
1913                 return v4l2_queryctrl(vfd->ctrl_handler, p);
1914         if (ops->vidioc_queryctrl)
1915                 return ops->vidioc_queryctrl(file, fh, p);
1916         return -ENOTTY;
1917 }
1918
1919 static int v4l_query_ext_ctrl(const struct v4l2_ioctl_ops *ops,
1920                                 struct file *file, void *fh, void *arg)
1921 {
1922         struct video_device *vfd = video_devdata(file);
1923         struct v4l2_query_ext_ctrl *p = arg;
1924         struct v4l2_fh *vfh =
1925                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1926
1927         if (vfh && vfh->ctrl_handler)
1928                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, p);
1929         if (vfd->ctrl_handler)
1930                 return v4l2_query_ext_ctrl(vfd->ctrl_handler, p);
1931         if (ops->vidioc_query_ext_ctrl)
1932                 return ops->vidioc_query_ext_ctrl(file, fh, p);
1933         return -ENOTTY;
1934 }
1935
1936 static int v4l_querymenu(const struct v4l2_ioctl_ops *ops,
1937                                 struct file *file, void *fh, void *arg)
1938 {
1939         struct video_device *vfd = video_devdata(file);
1940         struct v4l2_querymenu *p = arg;
1941         struct v4l2_fh *vfh =
1942                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1943
1944         if (vfh && vfh->ctrl_handler)
1945                 return v4l2_querymenu(vfh->ctrl_handler, p);
1946         if (vfd->ctrl_handler)
1947                 return v4l2_querymenu(vfd->ctrl_handler, p);
1948         if (ops->vidioc_querymenu)
1949                 return ops->vidioc_querymenu(file, fh, p);
1950         return -ENOTTY;
1951 }
1952
1953 static int v4l_g_ctrl(const struct v4l2_ioctl_ops *ops,
1954                                 struct file *file, void *fh, void *arg)
1955 {
1956         struct video_device *vfd = video_devdata(file);
1957         struct v4l2_control *p = arg;
1958         struct v4l2_fh *vfh =
1959                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1960         struct v4l2_ext_controls ctrls;
1961         struct v4l2_ext_control ctrl;
1962
1963         if (vfh && vfh->ctrl_handler)
1964                 return v4l2_g_ctrl(vfh->ctrl_handler, p);
1965         if (vfd->ctrl_handler)
1966                 return v4l2_g_ctrl(vfd->ctrl_handler, p);
1967         if (ops->vidioc_g_ctrl)
1968                 return ops->vidioc_g_ctrl(file, fh, p);
1969         if (ops->vidioc_g_ext_ctrls == NULL)
1970                 return -ENOTTY;
1971
1972         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1973         ctrls.count = 1;
1974         ctrls.controls = &ctrl;
1975         ctrl.id = p->id;
1976         ctrl.value = p->value;
1977         if (check_ext_ctrls(&ctrls, 1)) {
1978                 int ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1979
1980                 if (ret == 0)
1981                         p->value = ctrl.value;
1982                 return ret;
1983         }
1984         return -EINVAL;
1985 }
1986
1987 static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
1988                                 struct file *file, void *fh, void *arg)
1989 {
1990         struct video_device *vfd = video_devdata(file);
1991         struct v4l2_control *p = arg;
1992         struct v4l2_fh *vfh =
1993                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1994         struct v4l2_ext_controls ctrls;
1995         struct v4l2_ext_control ctrl;
1996
1997         if (vfh && vfh->ctrl_handler)
1998                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
1999         if (vfd->ctrl_handler)
2000                 return v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);
2001         if (ops->vidioc_s_ctrl)
2002                 return ops->vidioc_s_ctrl(file, fh, p);
2003         if (ops->vidioc_s_ext_ctrls == NULL)
2004                 return -ENOTTY;
2005
2006         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
2007         ctrls.count = 1;
2008         ctrls.controls = &ctrl;
2009         ctrl.id = p->id;
2010         ctrl.value = p->value;
2011         if (check_ext_ctrls(&ctrls, 1))
2012                 return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
2013         return -EINVAL;
2014 }
2015
2016 static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2017                                 struct file *file, void *fh, void *arg)
2018 {
2019         struct video_device *vfd = video_devdata(file);
2020         struct v4l2_ext_controls *p = arg;
2021         struct v4l2_fh *vfh =
2022                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2023
2024         p->error_idx = p->count;
2025         if (vfh && vfh->ctrl_handler)
2026                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
2027         if (vfd->ctrl_handler)
2028                 return v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
2029         if (ops->vidioc_g_ext_ctrls == NULL)
2030                 return -ENOTTY;
2031         return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
2032                                         -EINVAL;
2033 }
2034
2035 static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2036                                 struct file *file, void *fh, void *arg)
2037 {
2038         struct video_device *vfd = video_devdata(file);
2039         struct v4l2_ext_controls *p = arg;
2040         struct v4l2_fh *vfh =
2041                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2042
2043         p->error_idx = p->count;
2044         if (vfh && vfh->ctrl_handler)
2045                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
2046         if (vfd->ctrl_handler)
2047                 return v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
2048         if (ops->vidioc_s_ext_ctrls == NULL)
2049                 return -ENOTTY;
2050         return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
2051                                         -EINVAL;
2052 }
2053
2054 static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2055                                 struct file *file, void *fh, void *arg)
2056 {
2057         struct video_device *vfd = video_devdata(file);
2058         struct v4l2_ext_controls *p = arg;
2059         struct v4l2_fh *vfh =
2060                 test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2061
2062         p->error_idx = p->count;
2063         if (vfh && vfh->ctrl_handler)
2064                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
2065         if (vfd->ctrl_handler)
2066                 return v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
2067         if (ops->vidioc_try_ext_ctrls == NULL)
2068                 return -ENOTTY;
2069         return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
2070                                         -EINVAL;
2071 }
2072
2073 static int v4l_g_crop(const struct v4l2_ioctl_ops *ops,
2074                                 struct file *file, void *fh, void *arg)
2075 {
2076         struct v4l2_crop *p = arg;
2077         struct v4l2_selection s = {
2078                 .type = p->type,
2079         };
2080         int ret;
2081
2082         if (ops->vidioc_g_crop)
2083                 return ops->vidioc_g_crop(file, fh, p);
2084         /* simulate capture crop using selection api */
2085
2086         /* crop means compose for output devices */
2087         if (V4L2_TYPE_IS_OUTPUT(p->type))
2088                 s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
2089         else
2090                 s.target = V4L2_SEL_TGT_CROP_ACTIVE;
2091
2092         ret = ops->vidioc_g_selection(file, fh, &s);
2093
2094         /* copying results to old structure on success */
2095         if (!ret)
2096                 p->c = s.r;
2097         return ret;
2098 }
2099
2100 static int v4l_s_crop(const struct v4l2_ioctl_ops *ops,
2101                                 struct file *file, void *fh, void *arg)
2102 {
2103         struct v4l2_crop *p = arg;
2104         struct v4l2_selection s = {
2105                 .type = p->type,
2106                 .r = p->c,
2107         };
2108
2109         if (ops->vidioc_s_crop)
2110                 return ops->vidioc_s_crop(file, fh, p);
2111         /* simulate capture crop using selection api */
2112
2113         /* crop means compose for output devices */
2114         if (V4L2_TYPE_IS_OUTPUT(p->type))
2115                 s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
2116         else
2117                 s.target = V4L2_SEL_TGT_CROP_ACTIVE;
2118
2119         return ops->vidioc_s_selection(file, fh, &s);
2120 }
2121
2122 static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
2123                                 struct file *file, void *fh, void *arg)
2124 {
2125         struct v4l2_cropcap *p = arg;
2126
2127         if (ops->vidioc_g_selection) {
2128                 struct v4l2_selection s = { .type = p->type };
2129                 int ret;
2130
2131                 /* obtaining bounds */
2132                 if (V4L2_TYPE_IS_OUTPUT(p->type))
2133                         s.target = V4L2_SEL_TGT_COMPOSE_BOUNDS;
2134                 else
2135                         s.target = V4L2_SEL_TGT_CROP_BOUNDS;
2136
2137                 ret = ops->vidioc_g_selection(file, fh, &s);
2138                 if (ret)
2139                         return ret;
2140                 p->bounds = s.r;
2141
2142                 /* obtaining defrect */
2143                 if (V4L2_TYPE_IS_OUTPUT(p->type))
2144                         s.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
2145                 else
2146                         s.target = V4L2_SEL_TGT_CROP_DEFAULT;
2147
2148                 ret = ops->vidioc_g_selection(file, fh, &s);
2149                 if (ret)
2150                         return ret;
2151                 p->defrect = s.r;
2152         }
2153
2154         /* setting trivial pixelaspect */
2155         p->pixelaspect.numerator = 1;
2156         p->pixelaspect.denominator = 1;
2157
2158         if (ops->vidioc_cropcap)
2159                 return ops->vidioc_cropcap(file, fh, p);
2160
2161         return 0;
2162 }
2163
2164 static int v4l_log_status(const struct v4l2_ioctl_ops *ops,
2165                                 struct file *file, void *fh, void *arg)
2166 {
2167         struct video_device *vfd = video_devdata(file);
2168         int ret;
2169
2170         if (vfd->v4l2_dev)
2171                 pr_info("%s: =================  START STATUS  =================\n",
2172                         vfd->v4l2_dev->name);
2173         ret = ops->vidioc_log_status(file, fh);
2174         if (vfd->v4l2_dev)
2175                 pr_info("%s: ==================  END STATUS  ==================\n",
2176                         vfd->v4l2_dev->name);
2177         return ret;
2178 }
2179
2180 static int v4l_dbg_g_register(const struct v4l2_ioctl_ops *ops,
2181                                 struct file *file, void *fh, void *arg)
2182 {
2183 #ifdef CONFIG_VIDEO_ADV_DEBUG
2184         struct v4l2_dbg_register *p = arg;
2185         struct video_device *vfd = video_devdata(file);
2186         struct v4l2_subdev *sd;
2187         int idx = 0;
2188
2189         if (!capable(CAP_SYS_ADMIN))
2190                 return -EPERM;
2191         if (p->match.type == V4L2_CHIP_MATCH_SUBDEV) {
2192                 if (vfd->v4l2_dev == NULL)
2193                         return -EINVAL;
2194                 v4l2_device_for_each_subdev(sd, vfd->v4l2_dev)
2195                         if (p->match.addr == idx++)
2196                                 return v4l2_subdev_call(sd, core, g_register, p);
2197                 return -EINVAL;
2198         }
2199         if (ops->vidioc_g_register && p->match.type == V4L2_CHIP_MATCH_BRIDGE &&
2200             (ops->vidioc_g_chip_info || p->match.addr == 0))
2201                 return ops->vidioc_g_register(file, fh, p);
2202         return -EINVAL;
2203 #else
2204         return -ENOTTY;
2205 #endif
2206 }
2207
2208 static int v4l_dbg_s_register(const struct v4l2_ioctl_ops *ops,
2209                                 struct file *file, void *fh, void *arg)
2210 {
2211 #ifdef CONFIG_VIDEO_ADV_DEBUG
2212         const struct v4l2_dbg_register *p = arg;
2213         struct video_device *vfd = video_devdata(file);
2214         struct v4l2_subdev *sd;
2215         int idx = 0;
2216
2217         if (!capable(CAP_SYS_ADMIN))
2218                 return -EPERM;
2219         if (p->match.type == V4L2_CHIP_MATCH_SUBDEV) {
2220                 if (vfd->v4l2_dev == NULL)
2221                         return -EINVAL;
2222                 v4l2_device_for_each_subdev(sd, vfd->v4l2_dev)
2223                         if (p->match.addr == idx++)
2224                                 return v4l2_subdev_call(sd, core, s_register, p);
2225                 return -EINVAL;
2226         }
2227         if (ops->vidioc_s_register && p->match.type == V4L2_CHIP_MATCH_BRIDGE &&
2228             (ops->vidioc_g_chip_info || p->match.addr == 0))
2229                 return ops->vidioc_s_register(file, fh, p);
2230         return -EINVAL;
2231 #else
2232         return -ENOTTY;
2233 #endif
2234 }
2235
2236 static int v4l_dbg_g_chip_info(const struct v4l2_ioctl_ops *ops,
2237                                 struct file *file, void *fh, void *arg)
2238 {
2239 #ifdef CONFIG_VIDEO_ADV_DEBUG
2240         struct video_device *vfd = video_devdata(file);
2241         struct v4l2_dbg_chip_info *p = arg;
2242         struct v4l2_subdev *sd;
2243         int idx = 0;
2244
2245         switch (p->match.type) {
2246         case V4L2_CHIP_MATCH_BRIDGE:
2247                 if (ops->vidioc_s_register)
2248                         p->flags |= V4L2_CHIP_FL_WRITABLE;
2249                 if (ops->vidioc_g_register)
2250                         p->flags |= V4L2_CHIP_FL_READABLE;
2251                 strlcpy(p->name, vfd->v4l2_dev->name, sizeof(p->name));
2252                 if (ops->vidioc_g_chip_info)
2253                         return ops->vidioc_g_chip_info(file, fh, arg);
2254                 if (p->match.addr)
2255                         return -EINVAL;
2256                 return 0;
2257
2258         case V4L2_CHIP_MATCH_SUBDEV:
2259                 if (vfd->v4l2_dev == NULL)
2260                         break;
2261                 v4l2_device_for_each_subdev(sd, vfd->v4l2_dev) {
2262                         if (p->match.addr != idx++)
2263                                 continue;
2264                         if (sd->ops->core && sd->ops->core->s_register)
2265                                 p->flags |= V4L2_CHIP_FL_WRITABLE;
2266                         if (sd->ops->core && sd->ops->core->g_register)
2267                                 p->flags |= V4L2_CHIP_FL_READABLE;
2268                         strlcpy(p->name, sd->name, sizeof(p->name));
2269                         return 0;
2270                 }
2271                 break;
2272         }
2273         return -EINVAL;
2274 #else
2275         return -ENOTTY;
2276 #endif
2277 }
2278
2279 static int v4l_dqevent(const struct v4l2_ioctl_ops *ops,
2280                                 struct file *file, void *fh, void *arg)
2281 {
2282         return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
2283 }
2284
2285 static int v4l_subscribe_event(const struct v4l2_ioctl_ops *ops,
2286                                 struct file *file, void *fh, void *arg)
2287 {
2288         return ops->vidioc_subscribe_event(fh, arg);
2289 }
2290
2291 static int v4l_unsubscribe_event(const struct v4l2_ioctl_ops *ops,
2292                                 struct file *file, void *fh, void *arg)
2293 {
2294         return ops->vidioc_unsubscribe_event(fh, arg);
2295 }
2296
2297 static int v4l_g_sliced_vbi_cap(const struct v4l2_ioctl_ops *ops,
2298                                 struct file *file, void *fh, void *arg)
2299 {
2300         struct v4l2_sliced_vbi_cap *p = arg;
2301         int ret = check_fmt(file, p->type);
2302
2303         if (ret)
2304                 return ret;
2305
2306         /* Clear up to type, everything after type is zeroed already */
2307         memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
2308
2309         return ops->vidioc_g_sliced_vbi_cap(file, fh, p);
2310 }
2311
2312 static int v4l_enum_freq_bands(const struct v4l2_ioctl_ops *ops,
2313                                 struct file *file, void *fh, void *arg)
2314 {
2315         struct video_device *vfd = video_devdata(file);
2316         struct v4l2_frequency_band *p = arg;
2317         enum v4l2_tuner_type type;
2318         int err;
2319
2320         if (vfd->vfl_type == VFL_TYPE_SDR) {
2321                 if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
2322                         return -EINVAL;
2323                 type = p->type;
2324         } else {
2325                 type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
2326                                 V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
2327                 if (type != p->type)
2328                         return -EINVAL;
2329         }
2330         if (ops->vidioc_enum_freq_bands) {
2331                 err = ops->vidioc_enum_freq_bands(file, fh, p);
2332                 if (err != -ENOTTY)
2333                         return err;
2334         }
2335         if (is_valid_ioctl(vfd, VIDIOC_G_TUNER)) {
2336                 struct v4l2_tuner t = {
2337                         .index = p->tuner,
2338                         .type = type,
2339                 };
2340
2341                 if (p->index)
2342                         return -EINVAL;
2343                 err = ops->vidioc_g_tuner(file, fh, &t);
2344                 if (err)
2345                         return err;
2346                 p->capability = t.capability | V4L2_TUNER_CAP_FREQ_BANDS;
2347                 p->rangelow = t.rangelow;
2348                 p->rangehigh = t.rangehigh;
2349                 p->modulation = (type == V4L2_TUNER_RADIO) ?
2350                         V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
2351                 return 0;
2352         }
2353         if (is_valid_ioctl(vfd, VIDIOC_G_MODULATOR)) {
2354                 struct v4l2_modulator m = {
2355                         .index = p->tuner,
2356                 };
2357
2358                 if (type != V4L2_TUNER_RADIO)
2359                         return -EINVAL;
2360                 if (p->index)
2361                         return -EINVAL;
2362                 err = ops->vidioc_g_modulator(file, fh, &m);
2363                 if (err)
2364                         return err;
2365                 p->capability = m.capability | V4L2_TUNER_CAP_FREQ_BANDS;
2366                 p->rangelow = m.rangelow;
2367                 p->rangehigh = m.rangehigh;
2368                 p->modulation = (type == V4L2_TUNER_RADIO) ?
2369                         V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
2370                 return 0;
2371         }
2372         return -ENOTTY;
2373 }
2374
2375 struct v4l2_ioctl_info {
2376         unsigned int ioctl;
2377         u32 flags;
2378         const char * const name;
2379         union {
2380                 u32 offset;
2381                 int (*func)(const struct v4l2_ioctl_ops *ops,
2382                                 struct file *file, void *fh, void *p);
2383         } u;
2384         void (*debug)(const void *arg, bool write_only);
2385 };
2386
2387 /* This control needs a priority check */
2388 #define INFO_FL_PRIO    (1 << 0)
2389 /* This control can be valid if the filehandle passes a control handler. */
2390 #define INFO_FL_CTRL    (1 << 1)
2391 /* This is a standard ioctl, no need for special code */
2392 #define INFO_FL_STD     (1 << 2)
2393 /* This is ioctl has its own function */
2394 #define INFO_FL_FUNC    (1 << 3)
2395 /* Queuing ioctl */
2396 #define INFO_FL_QUEUE   (1 << 4)
2397 /* Zero struct from after the field to the end */
2398 #define INFO_FL_CLEAR(v4l2_struct, field)                       \
2399         ((offsetof(struct v4l2_struct, field) +                 \
2400           sizeof(((struct v4l2_struct *)0)->field)) << 16)
2401 #define INFO_FL_CLEAR_MASK (_IOC_SIZEMASK << 16)
2402
2403 #define IOCTL_INFO_STD(_ioctl, _vidioc, _debug, _flags)                 \
2404         [_IOC_NR(_ioctl)] = {                                           \
2405                 .ioctl = _ioctl,                                        \
2406                 .flags = _flags | INFO_FL_STD,                          \
2407                 .name = #_ioctl,                                        \
2408                 .u.offset = offsetof(struct v4l2_ioctl_ops, _vidioc),   \
2409                 .debug = _debug,                                        \
2410         }
2411
2412 #define IOCTL_INFO_FNC(_ioctl, _func, _debug, _flags)                   \
2413         [_IOC_NR(_ioctl)] = {                                           \
2414                 .ioctl = _ioctl,                                        \
2415                 .flags = _flags | INFO_FL_FUNC,                         \
2416                 .name = #_ioctl,                                        \
2417                 .u.func = _func,                                        \
2418                 .debug = _debug,                                        \
2419         }
2420
2421 static struct v4l2_ioctl_info v4l2_ioctls[] = {
2422         IOCTL_INFO_FNC(VIDIOC_QUERYCAP, v4l_querycap, v4l_print_querycap, 0),
2423         IOCTL_INFO_FNC(VIDIOC_ENUM_FMT, v4l_enum_fmt, v4l_print_fmtdesc, INFO_FL_CLEAR(v4l2_fmtdesc, type)),
2424         IOCTL_INFO_FNC(VIDIOC_G_FMT, v4l_g_fmt, v4l_print_format, 0),
2425         IOCTL_INFO_FNC(VIDIOC_S_FMT, v4l_s_fmt, v4l_print_format, INFO_FL_PRIO),
2426         IOCTL_INFO_FNC(VIDIOC_REQBUFS, v4l_reqbufs, v4l_print_requestbuffers, INFO_FL_PRIO | INFO_FL_QUEUE),
2427         IOCTL_INFO_FNC(VIDIOC_QUERYBUF, v4l_querybuf, v4l_print_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
2428         IOCTL_INFO_STD(VIDIOC_G_FBUF, vidioc_g_fbuf, v4l_print_framebuffer, 0),
2429         IOCTL_INFO_STD(VIDIOC_S_FBUF, vidioc_s_fbuf, v4l_print_framebuffer, INFO_FL_PRIO),
2430         IOCTL_INFO_FNC(VIDIOC_OVERLAY, v4l_overlay, v4l_print_u32, INFO_FL_PRIO),
2431         IOCTL_INFO_FNC(VIDIOC_QBUF, v4l_qbuf, v4l_print_buffer, INFO_FL_QUEUE),
2432         IOCTL_INFO_STD(VIDIOC_EXPBUF, vidioc_expbuf, v4l_print_exportbuffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_exportbuffer, flags)),
2433         IOCTL_INFO_FNC(VIDIOC_DQBUF, v4l_dqbuf, v4l_print_buffer, INFO_FL_QUEUE),
2434         IOCTL_INFO_FNC(VIDIOC_STREAMON, v4l_streamon, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
2435         IOCTL_INFO_FNC(VIDIOC_STREAMOFF, v4l_streamoff, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
2436         IOCTL_INFO_FNC(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),
2437         IOCTL_INFO_FNC(VIDIOC_S_PARM, v4l_s_parm, v4l_print_streamparm, INFO_FL_PRIO),
2438         IOCTL_INFO_STD(VIDIOC_G_STD, vidioc_g_std, v4l_print_std, 0),
2439         IOCTL_INFO_FNC(VIDIOC_S_STD, v4l_s_std, v4l_print_std, INFO_FL_PRIO),
2440         IOCTL_INFO_FNC(VIDIOC_ENUMSTD, v4l_enumstd, v4l_print_standard, INFO_FL_CLEAR(v4l2_standard, index)),
2441         IOCTL_INFO_FNC(VIDIOC_ENUMINPUT, v4l_enuminput, v4l_print_enuminput, INFO_FL_CLEAR(v4l2_input, index)),
2442         IOCTL_INFO_FNC(VIDIOC_G_CTRL, v4l_g_ctrl, v4l_print_control, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_control, id)),
2443         IOCTL_INFO_FNC(VIDIOC_S_CTRL, v4l_s_ctrl, v4l_print_control, INFO_FL_PRIO | INFO_FL_CTRL),
2444         IOCTL_INFO_FNC(VIDIOC_G_TUNER, v4l_g_tuner, v4l_print_tuner, INFO_FL_CLEAR(v4l2_tuner, index)),
2445         IOCTL_INFO_FNC(VIDIOC_S_TUNER, v4l_s_tuner, v4l_print_tuner, INFO_FL_PRIO),
2446         IOCTL_INFO_STD(VIDIOC_G_AUDIO, vidioc_g_audio, v4l_print_audio, 0),
2447         IOCTL_INFO_STD(VIDIOC_S_AUDIO, vidioc_s_audio, v4l_print_audio, INFO_FL_PRIO),
2448         IOCTL_INFO_FNC(VIDIOC_QUERYCTRL, v4l_queryctrl, v4l_print_queryctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_queryctrl, id)),
2449         IOCTL_INFO_FNC(VIDIOC_QUERYMENU, v4l_querymenu, v4l_print_querymenu, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_querymenu, index)),
2450         IOCTL_INFO_STD(VIDIOC_G_INPUT, vidioc_g_input, v4l_print_u32, 0),
2451         IOCTL_INFO_FNC(VIDIOC_S_INPUT, v4l_s_input, v4l_print_u32, INFO_FL_PRIO),
2452         IOCTL_INFO_STD(VIDIOC_G_EDID, vidioc_g_edid, v4l_print_edid, 0),
2453         IOCTL_INFO_STD(VIDIOC_S_EDID, vidioc_s_edid, v4l_print_edid, INFO_FL_PRIO),
2454         IOCTL_INFO_STD(VIDIOC_G_OUTPUT, vidioc_g_output, v4l_print_u32, 0),
2455         IOCTL_INFO_FNC(VIDIOC_S_OUTPUT, v4l_s_output, v4l_print_u32, INFO_FL_PRIO),
2456         IOCTL_INFO_FNC(VIDIOC_ENUMOUTPUT, v4l_enumoutput, v4l_print_enumoutput, INFO_FL_CLEAR(v4l2_output, index)),
2457         IOCTL_INFO_STD(VIDIOC_G_AUDOUT, vidioc_g_audout, v4l_print_audioout, 0),
2458         IOCTL_INFO_STD(VIDIOC_S_AUDOUT, vidioc_s_audout, v4l_print_audioout, INFO_FL_PRIO),
2459         IOCTL_INFO_FNC(VIDIOC_G_MODULATOR, v4l_g_modulator, v4l_print_modulator, INFO_FL_CLEAR(v4l2_modulator, index)),
2460         IOCTL_INFO_FNC(VIDIOC_S_MODULATOR, v4l_s_modulator, v4l_print_modulator, INFO_FL_PRIO),
2461         IOCTL_INFO_FNC(VIDIOC_G_FREQUENCY, v4l_g_frequency, v4l_print_frequency, INFO_FL_CLEAR(v4l2_frequency, tuner)),
2462         IOCTL_INFO_FNC(VIDIOC_S_FREQUENCY, v4l_s_frequency, v4l_print_frequency, INFO_FL_PRIO),
2463         IOCTL_INFO_FNC(VIDIOC_CROPCAP, v4l_cropcap, v4l_print_cropcap, INFO_FL_CLEAR(v4l2_cropcap, type)),
2464         IOCTL_INFO_FNC(VIDIOC_G_CROP, v4l_g_crop, v4l_print_crop, INFO_FL_CLEAR(v4l2_crop, type)),
2465         IOCTL_INFO_FNC(VIDIOC_S_CROP, v4l_s_crop, v4l_print_crop, INFO_FL_PRIO),
2466         IOCTL_INFO_STD(VIDIOC_G_SELECTION, vidioc_g_selection, v4l_print_selection, INFO_FL_CLEAR(v4l2_selection, r)),
2467         IOCTL_INFO_STD(VIDIOC_S_SELECTION, vidioc_s_selection, v4l_print_selection, INFO_FL_PRIO | INFO_FL_CLEAR(v4l2_selection, r)),
2468         IOCTL_INFO_STD(VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp, v4l_print_jpegcompression, 0),
2469         IOCTL_INFO_STD(VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp, v4l_print_jpegcompression, INFO_FL_PRIO),
2470         IOCTL_INFO_FNC(VIDIOC_QUERYSTD, v4l_querystd, v4l_print_std, 0),
2471         IOCTL_INFO_FNC(VIDIOC_TRY_FMT, v4l_try_fmt, v4l_print_format, 0),
2472         IOCTL_INFO_STD(VIDIOC_ENUMAUDIO, vidioc_enumaudio, v4l_print_audio, INFO_FL_CLEAR(v4l2_audio, index)),
2473         IOCTL_INFO_STD(VIDIOC_ENUMAUDOUT, vidioc_enumaudout, v4l_print_audioout, INFO_FL_CLEAR(v4l2_audioout, index)),
2474         IOCTL_INFO_FNC(VIDIOC_G_PRIORITY, v4l_g_priority, v4l_print_u32, 0),
2475         IOCTL_INFO_FNC(VIDIOC_S_PRIORITY, v4l_s_priority, v4l_print_u32, INFO_FL_PRIO),
2476         IOCTL_INFO_FNC(VIDIOC_G_SLICED_VBI_CAP, v4l_g_sliced_vbi_cap, v4l_print_sliced_vbi_cap, INFO_FL_CLEAR(v4l2_sliced_vbi_cap, type)),
2477         IOCTL_INFO_FNC(VIDIOC_LOG_STATUS, v4l_log_status, v4l_print_newline, 0),
2478         IOCTL_INFO_FNC(VIDIOC_G_EXT_CTRLS, v4l_g_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
2479         IOCTL_INFO_FNC(VIDIOC_S_EXT_CTRLS, v4l_s_ext_ctrls, v4l_print_ext_controls, INFO_FL_PRIO | INFO_FL_CTRL),
2480         IOCTL_INFO_FNC(VIDIOC_TRY_EXT_CTRLS, v4l_try_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
2481         IOCTL_INFO_STD(VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes, v4l_print_frmsizeenum, INFO_FL_CLEAR(v4l2_frmsizeenum, pixel_format)),
2482         IOCTL_INFO_STD(VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals, v4l_print_frmivalenum, INFO_FL_CLEAR(v4l2_frmivalenum, height)),
2483         IOCTL_INFO_STD(VIDIOC_G_ENC_INDEX, vidioc_g_enc_index, v4l_print_enc_idx, 0),
2484         IOCTL_INFO_STD(VIDIOC_ENCODER_CMD, vidioc_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_PRIO | INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
2485         IOCTL_INFO_STD(VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
2486         IOCTL_INFO_STD(VIDIOC_DECODER_CMD, vidioc_decoder_cmd, v4l_print_decoder_cmd, INFO_FL_PRIO),
2487         IOCTL_INFO_STD(VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd, v4l_print_decoder_cmd, 0),
2488         IOCTL_INFO_FNC(VIDIOC_DBG_S_REGISTER, v4l_dbg_s_register, v4l_print_dbg_register, 0),
2489         IOCTL_INFO_FNC(VIDIOC_DBG_G_REGISTER, v4l_dbg_g_register, v4l_print_dbg_register, 0),
2490         IOCTL_INFO_FNC(VIDIOC_S_HW_FREQ_SEEK, v4l_s_hw_freq_seek, v4l_print_hw_freq_seek, INFO_FL_PRIO),
2491         IOCTL_INFO_STD(VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings, v4l_print_dv_timings, INFO_FL_PRIO),
2492         IOCTL_INFO_STD(VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings, v4l_print_dv_timings, 0),
2493         IOCTL_INFO_FNC(VIDIOC_DQEVENT, v4l_dqevent, v4l_print_event, 0),
2494         IOCTL_INFO_FNC(VIDIOC_SUBSCRIBE_EVENT, v4l_subscribe_event, v4l_print_event_subscription, 0),
2495         IOCTL_INFO_FNC(VIDIOC_UNSUBSCRIBE_EVENT, v4l_unsubscribe_event, v4l_print_event_subscription, 0),
2496         IOCTL_INFO_FNC(VIDIOC_CREATE_BUFS, v4l_create_bufs, v4l_print_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
2497         IOCTL_INFO_FNC(VIDIOC_PREPARE_BUF, v4l_prepare_buf, v4l_print_buffer, INFO_FL_QUEUE),
2498         IOCTL_INFO_STD(VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings, v4l_print_enum_dv_timings, 0),
2499         IOCTL_INFO_STD(VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings, v4l_print_dv_timings, 0),
2500         IOCTL_INFO_STD(VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap, v4l_print_dv_timings_cap, INFO_FL_CLEAR(v4l2_dv_timings_cap, type)),
2501         IOCTL_INFO_FNC(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0),
2502         IOCTL_INFO_FNC(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)),
2503         IOCTL_INFO_FNC(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)),
2504 };
2505 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
2506
2507 bool v4l2_is_known_ioctl(unsigned int cmd)
2508 {
2509         if (_IOC_NR(cmd) >= V4L2_IOCTLS)
2510                 return false;
2511         return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
2512 }
2513
2514 struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev, unsigned cmd)
2515 {
2516         if (_IOC_NR(cmd) >= V4L2_IOCTLS)
2517                 return vdev->lock;
2518         if (test_bit(_IOC_NR(cmd), vdev->disable_locking))
2519                 return NULL;
2520         if (vdev->queue && vdev->queue->lock &&
2521                         (v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE))
2522                 return vdev->queue->lock;
2523         return vdev->lock;
2524 }
2525
2526 /* Common ioctl debug function. This function can be used by
2527    external ioctl messages as well as internal V4L ioctl */
2528 void v4l_printk_ioctl(const char *prefix, unsigned int cmd)
2529 {
2530         const char *dir, *type;
2531
2532         if (prefix)
2533                 printk(KERN_DEBUG "%s: ", prefix);
2534
2535         switch (_IOC_TYPE(cmd)) {
2536         case 'd':
2537                 type = "v4l2_int";
2538                 break;
2539         case 'V':
2540                 if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
2541                         type = "v4l2";
2542                         break;
2543                 }
2544                 pr_cont("%s", v4l2_ioctls[_IOC_NR(cmd)].name);
2545                 return;
2546         default:
2547                 type = "unknown";
2548                 break;
2549         }
2550
2551         switch (_IOC_DIR(cmd)) {
2552         case _IOC_NONE:              dir = "--"; break;
2553         case _IOC_READ:              dir = "r-"; break;
2554         case _IOC_WRITE:             dir = "-w"; break;
2555         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
2556         default:                     dir = "*ERR*"; break;
2557         }
2558         pr_cont("%s ioctl '%c', dir=%s, #%d (0x%08x)",
2559                 type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
2560 }
2561 EXPORT_SYMBOL(v4l_printk_ioctl);
2562
2563 static long __video_do_ioctl(struct file *file,
2564                 unsigned int cmd, void *arg)
2565 {
2566         struct video_device *vfd = video_devdata(file);
2567         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
2568         bool write_only = false;
2569         struct v4l2_ioctl_info default_info;
2570         const struct v4l2_ioctl_info *info;
2571         void *fh = file->private_data;
2572         struct v4l2_fh *vfh = NULL;
2573         int dev_debug = vfd->dev_debug;
2574         long ret = -ENOTTY;
2575
2576         if (ops == NULL) {
2577                 pr_warn("%s: has no ioctl_ops.\n",
2578                                 video_device_node_name(vfd));
2579                 return ret;
2580         }
2581
2582         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
2583                 vfh = file->private_data;
2584
2585         if (v4l2_is_known_ioctl(cmd)) {
2586                 info = &v4l2_ioctls[_IOC_NR(cmd)];
2587
2588                 if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
2589                     !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
2590                         goto done;
2591
2592                 if (vfh && (info->flags & INFO_FL_PRIO)) {
2593                         ret = v4l2_prio_check(vfd->prio, vfh->prio);
2594                         if (ret)
2595                                 goto done;
2596                 }
2597         } else {
2598                 default_info.ioctl = cmd;
2599                 default_info.flags = 0;
2600                 default_info.debug = v4l_print_default;
2601                 info = &default_info;
2602         }
2603
2604         write_only = _IOC_DIR(cmd) == _IOC_WRITE;
2605         if (info->flags & INFO_FL_STD) {
2606                 typedef int (*vidioc_op)(struct file *file, void *fh, void *p);
2607                 const void *p = vfd->ioctl_ops;
2608                 const vidioc_op *vidioc = p + info->u.offset;
2609
2610                 ret = (*vidioc)(file, fh, arg);
2611         } else if (info->flags & INFO_FL_FUNC) {
2612                 ret = info->u.func(ops, file, fh, arg);
2613         } else if (!ops->vidioc_default) {
2614                 ret = -ENOTTY;
2615         } else {
2616                 ret = ops->vidioc_default(file, fh,
2617                         vfh ? v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
2618                         cmd, arg);
2619         }
2620
2621 done:
2622         if (dev_debug & (V4L2_DEV_DEBUG_IOCTL | V4L2_DEV_DEBUG_IOCTL_ARG)) {
2623                 if (!(dev_debug & V4L2_DEV_DEBUG_STREAMING) &&
2624                     (cmd == VIDIOC_QBUF || cmd == VIDIOC_DQBUF))
2625                         return ret;
2626
2627                 v4l_printk_ioctl(video_device_node_name(vfd), cmd);
2628                 if (ret < 0)
2629                         pr_cont(": error %ld", ret);
2630                 if (!(dev_debug & V4L2_DEV_DEBUG_IOCTL_ARG))
2631                         pr_cont("\n");
2632                 else if (_IOC_DIR(cmd) == _IOC_NONE)
2633                         info->debug(arg, write_only);
2634                 else {
2635                         pr_cont(": ");
2636                         info->debug(arg, write_only);
2637                 }
2638         }
2639
2640         return ret;
2641 }
2642
2643 static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
2644                             void __user **user_ptr, void ***kernel_ptr)
2645 {
2646         int ret = 0;
2647
2648         switch (cmd) {
2649         case VIDIOC_PREPARE_BUF:
2650         case VIDIOC_QUERYBUF:
2651         case VIDIOC_QBUF:
2652         case VIDIOC_DQBUF: {
2653                 struct v4l2_buffer *buf = parg;
2654
2655                 if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
2656                         if (buf->length > VIDEO_MAX_PLANES) {
2657                                 ret = -EINVAL;
2658                                 break;
2659                         }
2660                         *user_ptr = (void __user *)buf->m.planes;
2661                         *kernel_ptr = (void **)&buf->m.planes;
2662                         *array_size = sizeof(struct v4l2_plane) * buf->length;
2663                         ret = 1;
2664                 }
2665                 break;
2666         }
2667
2668         case VIDIOC_G_EDID:
2669         case VIDIOC_S_EDID: {
2670                 struct v4l2_edid *edid = parg;
2671
2672                 if (edid->blocks) {
2673                         if (edid->blocks > 256) {
2674                                 ret = -EINVAL;
2675                                 break;
2676                         }
2677                         *user_ptr = (void __user *)edid->edid;
2678                         *kernel_ptr = (void **)&edid->edid;
2679                         *array_size = edid->blocks * 128;
2680                         ret = 1;
2681                 }
2682                 break;
2683         }
2684
2685         case VIDIOC_S_EXT_CTRLS:
2686         case VIDIOC_G_EXT_CTRLS:
2687         case VIDIOC_TRY_EXT_CTRLS: {
2688                 struct v4l2_ext_controls *ctrls = parg;
2689
2690                 if (ctrls->count != 0) {
2691                         if (ctrls->count > V4L2_CID_MAX_CTRLS) {
2692                                 ret = -EINVAL;
2693                                 break;
2694                         }
2695                         *user_ptr = (void __user *)ctrls->controls;
2696                         *kernel_ptr = (void **)&ctrls->controls;
2697                         *array_size = sizeof(struct v4l2_ext_control)
2698                                     * ctrls->count;
2699                         ret = 1;
2700                 }
2701                 break;
2702         }
2703         }
2704
2705         return ret;
2706 }
2707
2708 long
2709 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
2710                v4l2_kioctl func)
2711 {
2712         char    sbuf[128];
2713         void    *mbuf = NULL;
2714         void    *parg = (void *)arg;
2715         long    err  = -EINVAL;
2716         bool    has_array_args;
2717         size_t  array_size = 0;
2718         void __user *user_ptr = NULL;
2719         void    **kernel_ptr = NULL;
2720
2721         /*  Copy arguments into temp kernel buffer  */
2722         if (_IOC_DIR(cmd) != _IOC_NONE) {
2723                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2724                         parg = sbuf;
2725                 } else {
2726                         /* too big to allocate from stack */
2727                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2728                         if (NULL == mbuf)
2729                                 return -ENOMEM;
2730                         parg = mbuf;
2731                 }
2732
2733                 err = -EFAULT;
2734                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2735                         unsigned int n = _IOC_SIZE(cmd);
2736
2737                         /*
2738                          * In some cases, only a few fields are used as input,
2739                          * i.e. when the app sets "index" and then the driver
2740                          * fills in the rest of the structure for the thing
2741                          * with that index.  We only need to copy up the first
2742                          * non-input field.
2743                          */
2744                         if (v4l2_is_known_ioctl(cmd)) {
2745                                 u32 flags = v4l2_ioctls[_IOC_NR(cmd)].flags;
2746                                 if (flags & INFO_FL_CLEAR_MASK)
2747                                         n = (flags & INFO_FL_CLEAR_MASK) >> 16;
2748                         }
2749
2750                         if (copy_from_user(parg, (void __user *)arg, n))
2751                                 goto out;
2752
2753                         /* zero out anything we don't copy from userspace */
2754                         if (n < _IOC_SIZE(cmd))
2755                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2756                 } else {
2757                         /* read-only ioctl */
2758                         memset(parg, 0, _IOC_SIZE(cmd));
2759                 }
2760         }
2761
2762         err = check_array_args(cmd, parg, &array_size, &user_ptr, &kernel_ptr);
2763         if (err < 0)
2764                 goto out;
2765         has_array_args = err;
2766
2767         if (has_array_args) {
2768                 /*
2769                  * When adding new types of array args, make sure that the
2770                  * parent argument to ioctl (which contains the pointer to the
2771                  * array) fits into sbuf (so that mbuf will still remain
2772                  * unused up to here).
2773                  */
2774                 mbuf = kmalloc(array_size, GFP_KERNEL);
2775                 err = -ENOMEM;
2776                 if (NULL == mbuf)
2777                         goto out_array_args;
2778                 err = -EFAULT;
2779                 if (copy_from_user(mbuf, user_ptr, array_size))
2780                         goto out_array_args;
2781                 *kernel_ptr = mbuf;
2782         }
2783
2784         /* Handles IOCTL */
2785         err = func(file, cmd, parg);
2786         if (err == -ENOIOCTLCMD)
2787                 err = -ENOTTY;
2788         if (err == 0) {
2789                 if (cmd == VIDIOC_DQBUF)
2790                         trace_v4l2_dqbuf(video_devdata(file)->minor, parg);
2791                 else if (cmd == VIDIOC_QBUF)
2792                         trace_v4l2_qbuf(video_devdata(file)->minor, parg);
2793         }
2794
2795         if (has_array_args) {
2796                 *kernel_ptr = (void __force *)user_ptr;
2797                 if (copy_to_user(user_ptr, mbuf, array_size))
2798                         err = -EFAULT;
2799                 goto out_array_args;
2800         }
2801         /* VIDIOC_QUERY_DV_TIMINGS can return an error, but still have valid
2802            results that must be returned. */
2803         if (err < 0 && cmd != VIDIOC_QUERY_DV_TIMINGS)
2804                 goto out;
2805
2806 out_array_args:
2807         /*  Copy results into user buffer  */
2808         switch (_IOC_DIR(cmd)) {
2809         case _IOC_READ:
2810         case (_IOC_WRITE | _IOC_READ):
2811                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2812                         err = -EFAULT;
2813                 break;
2814         }
2815
2816 out:
2817         kfree(mbuf);
2818         return err;
2819 }
2820 EXPORT_SYMBOL(video_usercopy);
2821
2822 long video_ioctl2(struct file *file,
2823                unsigned int cmd, unsigned long arg)
2824 {
2825         return video_usercopy(file, cmd, arg, __video_do_ioctl);
2826 }
2827 EXPORT_SYMBOL(video_ioctl2);